Answers
ΔE for the combustion of glucose in kJ/mol is -2.81 kJ/mol
Note that the negative sign indicates that the combustion of glucose is exothermic (releases energy).
To calculate ΔE for the combustion of glucose in kJ/mol, we need to use the formula:
ΔE = q / n
where q is the heat released (or absorbed), and n is the number of moles of glucose burned. We can calculate q using the heat capacity of the calorimeter (C), the change in temperature (ΔT), and the mass of the calorimeter (m):
q = C × ΔT × m
We need to be careful with the signs in this calculation. Since the temperature of the calorimeter increased, the heat flowed out of the reaction and into the calorimeter, so q is negative. Also, the heat capacity of the calorimeter is given in kJ/K, so we need to convert the temperature change to kelvin:
ΔT = 28.745°C - 23.446°C = 5.299 K
Plugging in the values, we get:
q = -6.317 kJ/K × 5.299 K × 0.001 kg = -0.0334 kJ
Note that we converted the mass of the calorimeter to kilograms.
To calculate n, we need to divide the mass of glucose by its molar mass:
n = 2.150 g / 180.16 g/mol = 0.0119 mol
Finally, we can calculate ΔE:
ΔE = q / n = (-0.0334 kJ) / (0.0119 mol) = -2.81 kJ/mol
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Related Questions
A sample of helium gas is collected over water . The gas collected is a wet gas that includes helium (He) and water vapor (H20). If the pressure of water vapor (H20) is 21.2 mmHg, what is the pressure of the helium gas (He) if the total pressure is 855 mmHg?
Answers
The pressure of the helium gas (He) in the wet gas mixture is 833.8 mmHg.
In order to find the pressure of the helium gas in the wet gas mixture, we need to use the concept of partial pressures. According to Dalton's Law of Partial Pressures, the total pressure of a gas mixture is equal to the sum of the partial pressures of each individual gas present in the mixture. In this case, the wet gas mixture contains helium (He) and water vapor (H2O). The pressure of water vapor (H2O) is given as 21.2 mmHg, which means that the partial pressure of water vapor (H2O) in the mixture is 21.2 mmHg. We can now use the total pressure and the partial pressure of water vapor (H2O) to find the partial pressure of helium (He) in the mixture. To do this, we can subtract the partial pressure of water vapor (H2O) from the total pressure:
Partial pressure of helium (He) = Total pressure - Partial pressure of water vapor (H2O)
Partial pressure of helium (He) = 855 mmHg - 21.2 mmHg
Partial pressure of helium (He) = 833.8 mmHg
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HELP!! PLEASE ANSWER FAST!!
Which pair of compounds have the same empirical formula? (5 points)
Group of answer choices
C2H6 and CH
CH3 and C2H6
C3H8 and C3H
C2H2 and C2H
Answers
The pair of compounds with same empirical formula will be CH3 and C2H6
What is Empirical formula?Empirical formula of a specific compound is defined as the positive integer ratio of atoms that can be found in that specific compound.
Therefore, from the given option above,
The pair of compounds has the same empirical formula is
CH3 and C3H6
The empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound.
The empirical formula of a compound can be exemplified using sulfur monoxide, which would simply be SO, as is the empirical formula of disulfur dioxide, S₂O₂.
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CH3 and C2H6 will be the compounds that have the same empirical formula one another. Option B
What exactly does "empirical formula" mean?The positive integer ratio of atoms that can be found in a certain compound is what is meant to be understood when speaking about the empirical formula of that particular chemical.
Therefore, based on the alternative presented before,
The empirical formulas of the two compounds are identical to one another.
CH3 as well as C3H6
The empirical formula of a chemical compound is the most straightforward representation of the atomic number distribution in the molecule as a whole.
An example of an empirical formula for a molecule is the chemical symbol SO, which stands for sulfur monoxide. Another example is the empirical formula for disulfur dioxide, which is written as S2O2.
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A 57.07 g sample of a substance is initially at 24.3°C. After absorbing of 2911 J of heat, the temperature of the substance is 116.9 CWhat is the specific heat (SH) of the substance?
Answers
Answer:
Approximately \(0.551\; \rm J\cdot kg^{-1} \cdot \left(^\circ\! C \right)^{-1}\).
Explanation:
The specific heat of a material is the amount of energy required to increase unit mass (one gram) of this material by unit temperature (one degree Celsius.)
Calculate the increase in the temperature of this sample:
\(\Delta T = (116.9 - 24.3)\; \rm ^\circ\! C= 92.6\; \rm ^\circ\! C\).
The energy that this sample absorbed should be proportional the increase in its temperature (assuming that no phase change is involved.)
It took \(2911\; \rm J\) of energy to raise the temperature of this sample by \(\Delta T = 92.6\; \rm ^\circ\! C\). Therefore, raising the temperature of this sample by \(1\; \rm ^\circ\! C\) (unit temperature) would take only \(\displaystyle \frac{1}{92.6}\) as much energy. That corresponds to approximately \(31.436\; \rm J\) of energy.
On the other hand, the energy required to raise the temperature of this material by \(1\; \rm ^\circ\! C\) is proportional to the mass of the sample (also assuming no phase change.)
It took approximately \(31.436\; \rm J\) of energy to raise the temperature of \(57.07\; \rm g\) of this material by \(1\; \rm ^\circ C\). Therefore, it would take only \(\displaystyle \frac{1}{57.07}\) as much energy to raise the temperature of \(1\; \rm g\) (unit mass) of this material by \(1\; \rm ^\circ \! C\!\). That corresponds to approximately \(0.551\; \rm J\) of energy.
In other words, it takes approximately \(0.551\; \rm J\) to raise \(1\; \rm g\) (unit mass) of this material by \(1\; \rm ^\circ \! C\). Therefore, by definition, the specific heat of this material would be approximately \(0.551\; \rm J\cdot kg^{-1} \cdot \left(^\circ\! C \right)^{-1}\).
how many grams of water are needed to react with 71.0g CaN2?
Answers
Answer:
1
Explanation:
Mass of
C
a
C
N
2
= 75.0 g
From the equation,
C
a
C
N
2
(
s
)
+
3
H
2
O
(
l
)
→
C
a
C
O
3
(
s
)
+
2
N
H
3
(
g
)
1 mol of
C
a
C
N
2
reacts with 3 moles of water to give calcium carbonate and ammonia.
Number of moles of
C
a
C
N
2
,
n
=
G
i
v
e
n
m
a
s
s
M
o
l
a
r
m
a
s
s
Molar mass of
C
a
C
N
2
= 92.11 g/mol
Therefore,
n
C
a
C
N
2
=
75
g
92
.11
g
/
m
o
l
=
0
.814
m
o
l
Moles of water =Therefore,
n
C
a
C
N
2
=
75
g
92
.11
g
/
m
o
l
=
0
.814
m
o
l
Moles of water =
3
×
0
.814
m
o
l
e
s
=
2
.442
m
o
l
e
s
Mass of water needed;
=
m
o
l
e
s
o
f
w
a
t
e
r
×
m
o
l
a
r
m
a
s
s
o
f
w
a
t
e
r
=
2
.442
m
o
l
×
18
g
/
m
o
l
=
43
.956
g
Thus, 43.96 g of water is needed to react with 75 g of
C
a
C
N
2
.
A flammable gas made up of only carbon is found to effuse through a porous barrier in 1.50min. it takes an equal volume of bromine vapor 4.73min to effuse through the same barrier. Calculate the molar mass of the unknown gas and suggest what
the gas might be
Answers
Methane is the unidentified gas since its molar mass is 16 g/mol.
When describing atomic masses and molecular masses, the Dalton (Da) or unified atomic mass unit (u) are two alternative units of mass that are frequently employed. It is known to be 1/12 the mass of a carbon-12 atom and is also referred to as "amu" in older.
We must be aware that a gas's molar mass directly relates to how long it takes to diffuse.
t1/t2 = √M1/M2
Let t1 equal the 1.50 minutes it takes for the combustible gas to disseminate. Let t2 equal the 4.73 minutes it takes for the bromine vapor to disperse.
M1 = the flammable gas's molar mass equals
160 g/mol is the molar mass of the bromine vapor, or M2.
replacing values.
1.50/4.73 = √M1/160
(1.50/4.73) ^2 = M1/160
0.1006 = M1/160
M1 = 0.1006 × 160
M1 = 16 g/mol
Methane is the gas in question.
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Plants need sunlight, water, and minerals from the soil in order to grow and thrive. These factors
A.
are always abundant, allowing unlimited growth.
B.
limit the number of plant populations that can grow in an ecosystem.
C.
require human intervention to be replenished.
D.
prevent new plant populations from entering the ecosystem.
Answers
Answer:
B. limit the number of plant populations that can grow an ecosystem
Answer:
B. limit the number of plant populations that can grow in an ecosystem.
Explanation:
Passage 1
Passage 2
Dorothy Parker (1893-1967) was an American short-story
writer, poet, and critic best known for her satiric wit
This excerpt is from her essay titled Henry' in her book
Men Im Not Married To.
from "Henry"
by Dorothy Parker
You would really be surprised at the number of
things that Henry knows just a shade more
about than anybody else does. Naturally he
can't help realizing this about himself, but you
mustn't think for a minute that he has let it
spoil him. On the contrary... [w]hen it comes
to giving his time and his energy there is
nobody who could not admit that Henry is
Passage 1
Passage 2
Passage 1 Passage 2
Drag ONE sentence to EACH box to compare and
contr themes in Passage 1 and Passage 2.
Both
generous. To a fault, I have even heard people
go so far as to say.
... And that is the way Henry is about
everything. He will stroll over to a tennis court,
and stand on the side lines, at what I am sure
must be great personal inconvenience, calling
words of advice and suggestion for sets at a
stretch. I have even known him to follow his
friends all the way around a golf course,
offering constructive criticism on their form as
he goes. I tell you, in this day and generation,
you don't find many people who will go as far
out of their way for their friends as Henry does.
And I am far from being the only one who says
so, too.
strong friendships are based on emotion rather than
intellect.
Friends who remain detached from others may risk
friendships that expose their faults.
Friends who flaunt their perceived superiority may
risk losing friendships.
Most friendships are complicated because people are
imperfect.
Answers
If 120.4 grams of reactant completely breaks down (decomposes) to produce 106.4 grams of chlorine. What mass of nitrogen gas could be expected? *
Answers
Answer:
\(m_{nitrogen}=14g\)
Explanation:
Hello,
In this case, since we are talking about a chemical reaction in which a compound having nitrogen and chlorine is decomposed into chlorine and nitrogen, we must remember that the law of conservation of mass must be obeyed, for that reason, we notice that the mass of the whole reactants must equal the mass of the whole products, as shown below:
\(m_{reactants}=m_{products}\)
Next, we know there is only one single reactant and products are constituted by both chlorine and nitrogen:
\(m_{reactant}=m_{chlorine}+m_{nitrogen}\)
In such a way, we can compute the mass of nitrogen as shown below:
\(m_{nitrogen}=m_{reactant}-m_{chlorine}=120.4g-106.4g\\\\m_{nitrogen}=14g\)
Best regards.
is UF6 a covalent compound or an ionic compound?
Answers
Hey there,
Given - Is UF6 a covalent compound or an ionic compound?
Answer- Covalent compound
Reason - Even though, still a subject of debate, theoretical results indicate that the U–F bond is partially covalent and could even possess some multiple bond characters, resulting from F → U π interaction cause.
~ Benjemin360
Refuse-derived fuel has ______ energy content than raw refuse, but requires energy ______ before burning
Answers
Refuse derived fuel had Higher energy than raw trash, but it takes energy to sort it before burning.
Refuse Derived Fuel is referred to as RDF. The industry refers to the combustible materials that are uused to make this fuel as municipal solid waste, or MSW. Usually picked up from industrial or commercial settings, this garbage is crushed, dried, bagged, and then burned to produce electricity.
The Refuse Derived Fuel have more energy content as it is created from only selected solid muncipal wastes which have scientifically proved for its energy content.
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What is the mole of 125 mg of Na? How many Na atoms?
Answers
5.43 E -3 mols x 6.022 E 23 = 3.27 E 21 Na atoms
The following questions pertain to the element located in period 4 and group 15 of the periodic table.
What is the name of this element?
What is the atomic symbol for this element?
Is this element a metal, a nonmetal, or a metalloid?
What is the atomic number of this element?
How many protons does a neutral atom of this element have?
How many electrons does a neutral atom of this element have?
What is the average number of neutrons in a neutral atom of this element?
How many valence electrons does a neutral atom of this element have?
Assuming the atom is at ground state, or its lowest energy level, how many energy levels exist in its electron cloud?
Is the ion of this element larger or smaller than its neutral atom?
What is the charge on the monatomic ion of this element?
How many protons are in a monatomic ion of this element?
How many total electrons are in a monatomic ion of this element?
How many valence electrons are in a monatomic ion of this element?
Answers
Answer:
The name of this element is Nitrogen.
The atomic symbol for this element is N.
Nitrogen is a nonmetal.
The atomic number of Nitrogen is 7.
A neutral atom of Nitrogen has 7 protons.
A neutral atom of Nitrogen has 7 electrons.
The average number of neutrons in a neutral atom of Nitrogen is 7.
A neutral atom of Nitrogen has 5 valence electrons.
Assuming the atom is at ground state, or its lowest energy level, it has 2 energy levels in its electron cloud.
A Nitrogen ion is the same size as a neutral Nitrogen atom.
The charge on the monatomic ion of Nitrogen is +3.
There are 7 protons in a monatomic ion of Nitrogen.
There are 10 total electrons in a monatomic ion of Nitrogen.
There are 7 valence electrons in a monatomic ion of Nitrogen.
Soil is only useful if scientists can match it to a location. true or false
Answers
It is false that soil is only useful if scientists can match it to a location.
How is soil important?Soil is the unconsolidated mineral or organic material on the immediate surface of the earth that serves as a natural medium for the growth of land plants.
The following are reasons why soil is an important substance in science;
Soil provides ecosystem services critical for lifeSoil acts as a water filter and a growing medium as it provides habitat for billions of organismsSoil contributes to biodiversity, which supplies most of the antibiotics used to fight diseases.Therefore, the location of a soil sample doesn't have to be known for the soil to useful to scientists.
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You are given a sulfuric acid solution of unknown concentration. You dispense 10.00 mL of the unknown solution into an Erlenmeyer flask and add 12.2 mL of distilled water and a drop of phenopthalein to the flask. You fill your buret with 0.103 M NaOH (aq) solution and begin the titration. During the titration you rinse the tip and the sides of the Erlenmeyer flask with 3.52 mL of distilled water. It requires 10.38 mL of your NaOH (aq) solution to reach the endpoint and a very faint pink color in the flask. What is the concentration of your sulfuric acid solution in M (Remember the balanced equation for this reaction)?
Answers
Answer:
"0.053457 M" of sulfuric acid.
Explanation:
The given values are:
\(V\) = 10 mL solution
\(V_{added}\) = 12.20 mL
\(V_{total}\) = 22.20 mL
then,
M 0.103 M of NaOH,
\(V_{rinsed}\) = experiment will not be affected
\(V_{total \ base}\) = 10.38 mL
Now,
⇒ mol of NAOH = MV
= \(0.103\times 10.38\)
= \(1.06914 \ m\)
Whether Sulfuric acid, then
⇒ \(H_{2}SO_{4} + 2NaOH = Na_{2}SO_{4} + 2H_{2}O\)
⇒ \(mol \ of \ acid =\frac{1}{2}\times \ mol \ of \ base\)
⇒ \(1.06914 \ m \ mol \ of \ base = \frac{1}{2}\times 1.06914 = 0.53457 \ m \ mol \ of \ acid\)
Before any dilution:
\(V_{sample} = 10 \ mL\)
⇒ \(M \ acid = \frac{m \ mol}{V}\)
\(=\frac{ 0.53457 }{10}\)
\(=0.053457 \ M\) (Sulfuric acid)
1. Write the IUPAC names for the following 1.1 1.2 N 1.3 O NO2 x Y ·0 OH 5
Answers
1. The IUPAC name of N is nitrogen.
2. Nitrogen dioxide
3.The IUPAC name of O is oxygen
4.The IUPAC name of OH is hydroxyl.
The IUPAC name of ·0 is a radical. It is commonly found in organic chemistry and plays an important role in many reactions.
IUPAC names for the given compounds are:1.1. N: Nitrogen
The IUPAC name of N is nitrogen.
It is a non-metal and belongs to group 15 in the periodic table. It has an electronic configuration of 1s2 2s2 2p3.1.2. NO2: Nitrogen dioxide
Explanation: NO2 is a chemical compound that is formed by the combination of nitrogen and oxygen. It is a reddish-brown gas that has a pungent odor.
The IUPAC name of NO2 is nitrogen dioxide.1.3. O: Oxygen
Explanation: The IUPAC name of O is oxygen.
It is a non-metal and belongs to group 16 in the periodic table. It has an electronic configuration of 1s2 2s2 2p4.
X: UnknownExplanation: No IUPAC name can be given to an unknown compound as the structure and composition are not known.
Y: Hydroxyl Explanation: The IUPAC name of OH is hydroxyl.
It is a functional group that is composed of an oxygen atom and a hydrogen atom (-OH). It is commonly found in alcohols and phenols. ·0: RadicalExplanation: A radical is a molecule or an ion that contains an unpaired electron.
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Note: The complete question is given below
Provide the IUPAC names for the following compounds:
\(CH_3CH_2CH(CH_3)CH_2CH_2CH_2CH_3\)
C6H5CH(CH3)2
H2NCH2CH2CH2CH2CH2NH2
CH3CH2CH2CH2CH2OH
CH3CH2CH2CHOHCH3
What will weigh more when a chemical change is complete
Answers
when a chemical change is complete the reactant before the chemical reaction and the product after the chemical reactant will weigh same.
According to the law of mass of conservation : the mass in the chemical reaction is neither be created nor be destroyed. This means the the total mass of the reactant before the chemical reaction and the mass of the product after the reaction is same. we can say that atoms in the reactant side is equal to the atoms in the product side.
Thus, when a chemical change is complete the reactant before the chemical reaction and the product after the chemical reactant will weigh same.
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Classify each of the following processes as spontaneous or nonspontaneous
Answers
871g of sodium chloride is how many moles
Answers
Answer:
14.9 mol
Explanation:
To find the number of moles in a given mass of a sample of sodium chloride (NaCl), we can multiply the number of grams in the sample by the molar mass of sodium chloride, which is 58.44 g/mol.
871 g × (1 mol / 58.44 g)
= 871/58.44 mol
≈ 14.9 mol
Note that we rounded to 3 significant figures in the final answer because that is how many significant figures were given in the mass measurement of the sodium chloride sample.
Which state of matter is the strongest conductor of electricity?
Answers
Answer:
The strongest conductors are understood to be all metals. Their conductivity is dependent on their atoms' number of valence electrons. Such electrons are not tightly bound together and are free to pass. Metals have electrons like this in their atoms, which is why they conduct heat and electricity so well.
what are the functional group
present in ch3cooh and C2h5oh
Answers
C2H5OH - OH Alcohol
Space shuttles are made out of three main parts: rocket boosters, a fuel tank, and a(n) ___________.
Answers
Answer:
Orbiter
Explanation:
Space shuttles are made out of three main parts: rocket boosters, a fuel tank, and orbiter (the part that resembles an airplane
Complete the Lewis Dot structure for the molecule H-C≡N and determine how many bonding and non-bonding electrons nitrogen has:
Answers
Answer:
I believe that in H-C≡N, Nitrogen has 4 bonding electrons and 2 non-bonding electrons.
(:
Explanation:
Only two of these reactant concentration have a direct influence on the reaction rate Which two are they? In this experiment, you will determine the rate of an iodine clock reaction. The completion of this particular reaction is signalled by the sudden appearance of the dark-blue colour that is characteristic of the interaction of molecular iodine (I2) with starch. When the reaction is performed correctly, the blue colour appears so suddenly that it can be as startling as the sudden sound of an alarm clock, hence the title of the experiment. The rate of an iodine clock reaction depends on the concentrations of the reactants, as you would expect. Therefore, the time required for the appearance of the dark colour can be adjusted by adjusting the concentrations of the reactants (so one can set the “colour alarm” of a clock reaction just as you can set the sound alarm on a clock).You will study the rate of reduction of potassium persulfide (K2S2O8) by sodium iodide (NaI). The net ionic equation for this reaction is the following:S2O82– + 2 I - → 2 SO42– + I2 (1)The rate law for this reaction isRate = k [S2O82–]q [I -]
Answers
Matter and Change - Chemical reaction - Reactants and products.
A chemical reaction is a process in which some substances (reactants) change into different substances (products).
Answer:
The reactants are present in the start of the chemical reaction while products are present at the end of the chemical reaction.
A reaction rate is the change in concentration of a reactant or product with time, and it is affected by the concentration of the reactants and products. An increase in the concentration of one or more reactants results in an increase of the reaction rate.
In this case we have the following net ionic chemical reaction:
\(S_2O_8^{-2}+2I^-\rightarrow2SO_4^{-2}+I_2\)We can see that the reactants are:
\(\begin{gathered} S_2O_8^{-2} \\ \\ I^- \end{gathered}\)So an increase in the concentration of any of them would increase the rate of the reaction.
So the answer is B and C.
B: Iodide ions (I-)
C:Persulfate ions (S2O8-2)
Upon decomposition, one sample of magnesium fluoride produced 1.66 kg
of magnesium and 2.56 kg
of fluorine. A second sample produced 1.34 kg
of magnesium. How much fluorine (in grams) did the second sample produce?
Answers
The mass of Fluorine in grams in the second sample is 2066 g. The concept law of definite proportions is used here to obtain the mass of Fluorine in the second sample.
What is law of definite proportions?This law was stated by a French chemist, Louis Proust. It states that 'a chemical compound always contains the same elements combined together in the same proportion by mass'.
The mass of Mg in sample 1 is 1.66 kg and that of F is 2.56 kg. The mass of Mg in sample 2 is 1.34 kg and we have to find out the mass of F in second sample.
The mass of Fluorine in sample 2 can be obtained by using the mass ratio of the elements in sample 1.
In sample 1:
Mass of magnesium ÷ Mass of Fluorine = 1.66 kg ÷ 2.56 kg
In sample 2:
By using dimensional analysis,
Mass of Fluorine = 2.56 kg Fluorine ÷ 1.66 kg Magnesium × 1.34 kg Magnesium
Therefore the mass of Fluorine = 2.066 kg
The mass in kilogram can be converted into grams as:
Mass of Fluorine = 2.066 kg × 1000 g ÷ 1 kg = 2066 g
Thus the mass of Fluorine in the second sample is 2066 g.
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A 0.250 mol sample of gas at 35.0°C exerts a pressure of 700 torr in it's container. What pressure will the container exert if the volume expands to 10.0L and the temperature is cooled to 5.0°C?
Answers
I need help finding arm
Answers
Answer:
line 15 is were you can find the a then you look around for the r but as a heads up the m thats supposed to be there was actually inverted into a w in theory it must have been misprinted.
Explanation:
In Zeff periodicity of valence electron, explain the changes of Al -> Si
Answers
Now, when we compare aluminum (Al) and silicon (Si), we can see that Al is located to the left of Si in the third period of the periodic table.
Aluminum has 3 valence electrons, which are located in the 3p orbital. The effective nuclear charge experienced by these electrons is relatively low because the 3s and 3p electrons shield them from the nucleus. As a result, the valence electrons in Al are relatively easy to remove, making Al a good conductor of electricity.
On the other hand, silicon has 4 valence electrons, which are also in the 3p orbital. However, the effective nuclear charge experienced by these electrons is higher than that experienced by the valence electrons in Al. This is because silicon has more protons in the nucleus, which creates a stronger attractive force on the valence electrons. This makes silicon a poorer conductor of electricity than aluminum.
In summary, the Zeff periodicity of valence electrons explains the changes in the properties of elements across a period. As you move across a period from left to right, the effective nuclear charge (Zeff) experienced by valence electrons increases, making it harder to remove them. This results in changes in the physical and chemical properties of elements such as conductivity, reactivity, and electron affinity.
Which of the following happens during an endothermic chemical change?
Heat is released.
Net energy decreases.
Products have a higher total potential energy than the reactants.
Products have the same total potential energy as the reactants.
Answers
Answer:
products have a higher potential energy than the reactants
Explanation:
The total potential energy of the system increases for the endothermic reaction as the system absorbs energy from the surroundings. The total potential energy of the system decreases for the exothermic reaction as the system releases energy to the surroundings
The endothermic reaction results in the increase in the potential energy of the product than the reactant. Thus, option C is correct.
What are endothermic reactions?The endothermic reaction is given as one in which the heat is absorbed by the system, and no energy is released.
The increase in the heat of the product is mediated that governs the increase in the potential energy of the product than the reactant due to absorption. Thus, option C is correct.
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State three precautions necessary to ation. explain how you can prepare 0.2m solution of tetraoxosulphate (VI) acid in 400cm³ volumetric flask. (CH=1, 0=16, S=32; specify gravity = 1.84 percentage purity=98) Halls
Answers
Wear personal defence tools, follow the guidelines and be careful with chemicals. Measure 14.72g of \(H_2SO_4\), dissolve in distilled water, and make up to 400mL in a volumetric flask.
1. Always wear appropriate personal protective equipment such as gloves, goggles, and lab coat.
2. Read and follow the instructions carefully before handling any chemical.
3. Handle the chemicals in a well-ventilated area to prevent inhalation of harmful fumes.
To prepare a 0.2M solution of tetraoxosulphate (VI) acid in a \(400cm^3\) volumetric flask:
Calculate the amount of tetraoxosulphate (VI) acid required using the formula:
Mass = (Molarity x Volume x Molecular weight) / 1000
Where:
Molarity = 0.2M
Volume =\(400cm^3\)
Molecular weight = (4x16) + 32 + (6x16) = 98g/mol
Mass = (0.2 x 400 x 98) / 1000 = 7.84g
Weigh out 7.84g of tetraoxosulphate (VI) acid using a balance.
Transfer the weighed tetraoxosulphate (VI) acid into the \(400cm^3\) volumetric flask using a funnel.
Add distilled water to the flask until the volume reaches the \(400cm^3\) mark on the neck of the flask.
Stopper the flask and mix the solution thoroughly by inverting the flask several times.
It is important to specify the density of the tetraoxosulphate (VI) acid, as this will affect the mass required for the solution. In this case, the percentage purity of the acid is also given, which can be used to calculate the actual mass of the tetraoxosulphate (VI) acid needed.
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What is the Internal Energy of a Human Body? Define internal energy as Delta E.
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The internal energy of a human body is the net energy contained in the body due motion of its particle or molecules.
In a human body the internal energy is stored . It increases when the temperature of the body rises, or when the body observes some changes. Internal energy we can say that is the sum of kinetic and potential energy of all particles in the body.
Internal energy is a state function of a system and is an extensive quantity. Every substance possesses a fixed quantity of energy which depends upon its chemical nature and also on its state of existence. Every substance have a definite value of Internal energy.
The change in the Internal energy of a reaction may be considered as the difference between the internal energies of the two states.
ΔU = \(E_{B}\) - \(E_{A}\) where \(E_{B}\) and \(E_{A}\) are the initial energies of states A and B. Or we can also write the equation as:
ΔU = ΔE
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