Answers
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass.
The equation used is:
\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}} ……(1)
Given mass of aluminum = 2.98 g
Molar mass of aluminum = 27 g/mol
Plugging values in equation 1:
\text{Moles of aluminum}=\frac{2.98g}{27g/mol}=0.1104 mol
The given chemical equation follows:
2Al(s)+3CuSO_4(aq)\rightarrow Al_2(SO_4)_3(aq)+3Cu(s)
By the stoichiometry of the reaction:
If 2 moles of aluminum produces 3 moles of Cu
So, 0.1104 moles aluminium will produce = \frac{3}{2}\times 0.1104=0.1656mol of Cu
Molar mass of Cu = 63.5 g/mol
Plugging values in equation 1:
\text{Mass of Cu}=(0.1656mol\times 63.5g/mol)=10.516g
The percent yield of a reaction is calculated by using an equation:
\% \text{yield}=\frac{\text{Actual value}}{\text{Theoretical value}}\times 100 ……(2)
Given values:
% yield of product = 46.4 %
Theoretical value of the product = 10.516 g
Plugging values in equation 2, we get:
46.4=\frac{\text{Actual value of Cu}}{10.516g}\times 100\\\\\text{Actual value of Cu}=\frac{46.4\times 10.516}{100}\\\\\text{Actual value of Cu}=4.88g
Hence, the mass of Cu produced is 4.88 g
2Al + 3CuSO₄ → Al₂(SO₄)₃ + 3Cu
mole Al = 2.57 : 27 g/mole = 0.095
mole Cu = 3/2 x mole Al = 3/2 x 0.095 = 0.143
mass Cu (theoretical) = 0.143 x molar mass Cu = 0.143 x 63.5 g/mole = 9.08 g
mass Cu produced (actual, 56.9% yield) = 56.9% x 9.08 g = 5.17 g
Related Questions
The flounder can survive in very cold water, but only when water is in its liquid state. What property of water prevents the ocean from freezing solid when the temperature in the air is well below water's freezing point
Answers
The property of water that prevents the ocean from freezing solid when the temperature in the air is well below water's freezing point is the high heat capacity of water.
Water has a high heat capacity which makes it capable of absorbing a lot of heat before its temperature starts rising. The heat that is absorbed is used to break the intermolecular bonds that hold the water molecules together.
Therefore, this property enables water to resist freezing even when the temperature drops below its freezing point.
The heat capacity of water allows it to maintain a relatively stable temperature, and thus the temperature of the ocean does not drop below freezing, which would lead to the solidification of the ocean.
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which value represents the first ionization energy of a nonmetal
Answers
Answer:
increase in going from left to right across a given period.
Explanation:
Nonmetals, which are found in the right-hand region of the periodic table, have relatively large ionization energies and therefore tend to gain electrons. Ionization energies generally increase in going from left to right across a given period.
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The 4 in formula 4H2O is a
1. coefficient
2. subscript
3. superscript
4. binomial
Answers
Since it is a number that constant for the given substance
Hi! This is a science question...
Which of the following is NOT an example of acceleration?
speeding up
slowing down
remaining at rest
stopping
Answers
Answer:
C: remaining at rest
Explanation:
Acceleration (a) is the change in velocity (Δv), remaining at rest is not changing the velocity.
Which of these is a
property of a metal sample?
A. The sample insulates against electrical conductivity.
B. The valence electrons are held tightly in place to their atoms.
C. The sample will have a very low melting point.
D. The sample will be malleable.
Answers
Answer: D
Explanation:
A is incorrect as metals are good conductors as opposed to insulatorsB is incorrect as metals have a sea of delocalised electronsC is incorrect as whilst some metals have low melting points, the majority have high melting pointsD is correct as the layers of ions can slide over each other when a force is appliedif 30 ml of a 0.80 m solution of k is mixed with 50 ml of a 0.45 m solution of clo−4, will a precipitate be observed? the ksp for the following equilibrium is 0.004. kclo4(s)↽−−⇀k (aq) clo−4(aq)
Answers
If 30 ml of a 0.80 m solution of k is mixed with 50 ml of a 0.45 m solution of clo−4, a precipitate will be observed in this solution.
The solution contains k (potassium) and clo−4 (chlorate) ions and we are to find out if a precipitate will form or not. The ksp for the following equilibrium is 0.004. kclo4(s)↽−−⇀k (aq) clo−4(aq)
We can obtain the molarity of k ions as follows: 0.80 M = (moles of K)/(0.030 L)Moles of K = 0.80 M × 0.030 L = 0.024 mol
We can obtain the molarity of clo−4 ions as follows: 0.45 M = (moles of clo−4)/(0.050 L)Moles of clo−4 = 0.45 M × 0.050 L = 0.0225 mol
The concentration of K and clo−4 ions are 0.8 M and 0.45 M respectively. Now, we need to calculate the reaction quotient Q of the solution to find out whether the precipitate will form or not. Q = [K+][clo−4] = 0.8 M × 0.45 M = 0.36
Since Q (0.36) > Ksp (0.004), the reaction quotient is greater than the solubility product constant. It indicates that the product is more than what it should be. The excess products will precipitate to form a solid. Hence, we can say that a precipitate will be observed in this solution.
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N2 + 3H2 3H2 -> 2NH3
A H = -92.2 kJ
During the above reaction, energy is -
A) absorbed
B) created
C) destroyed
D) released
Answers
Given that the enthalpy change ΔH for the reaction is negative, energy is released during the reaction (Option D)
Data obtained from the questionEquation: N₂ + 3H₂ —> 2NH₃Enthalpy change (ΔH) = –92.2 KNature of energy=?How to determine the nature of the energyFrom the data given above, we can see that the enthalpy change (ΔH) for the reaction is negative.
This simple means that heat energy is lost to the environment.
Therefore, we can conclude that the during the reaction, energy is released (Option D)
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In your own words, describe the purpose of using a chemical equation.
PLEASEEEE HURRY
Answers
Answer:
Hey mate, here is your answer. Hope it helps you.
Explanation:
To show how substances in a chemical reaction interact and to keep track of all elements and the number of atoms in each element on each side of the equation.The purpose of writing a balanced chemical equation is to know: the reactants (starting material) and products (end results) that occur. the ratios in which they react so you can calculate how much reactants you need and how much products can be formed.
Answer:
Sample Response: Chemical equations show how chemicals interact when a reaction occurs. They use symbols and formulas to show the chemical reaction so that chemical names do not need to be written out. They also help keep track of all elements and the number of atoms of each element on each side of the equation.
Explanation:
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How many electron bonds are shared between tewo carbon atoms when they are joined by a double bond?
Answers
2 electron bonds are shared between two carbon atoms when they are joined by a double bond.
An atom is a particle of matter that uniquely defines a chemical element. Atoms consist of a central nucleus surrounded by one or more negatively charged electrons. The nucleus is positively charged and contains one or more relatively heavy particles known as protons and neutrons.
Atoms are made up of two types of elementary particles: electrons and quarks. Electrons occupy the space surrounding the nucleus. Each electron has a charge of -1. Quarks form protons and neutrons, which form the nucleus. About 99% of the human body is made up of atoms of hydrogen, carbon, nitrogen, and oxygen. It also contains much smaller amounts of other elements necessary for life. November 6, 2015
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To command activities at a hazardous materials incident site, the minimum level of training necessary is:_________
Answers
To command activities at a hazardous materials incident site, the minimum level of training necessary is: Hazardous Materials Specialist
Hazardous materials are solid, liquid or gaseous substances that due to their characteristics could damage human health, properties or the environment. They are also known as hazmat, an acronym for hazardous materials.
Hazardous materials can harm you if they:
Touch your skinSplash in your eyesGet into your airways or lungs when you breatheCause fires or explosionsPeople who are exposed to hazardous materials or are responsible for handling hazardous materials are required by federal regulations and policies to have hazardous materials training for proper handling.
What is a safety data sheet?Safety data sheet (SDS) is an important document that describes the physical and chemical properties of a chemical substance.
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During a phase change, such as melting or boiling, the kinetic energy __. Highlight correct answer
Answers
Answer: During a phase change, such as melting or boiling, the kinetic energy increases.
Explanation:
Kinetic energy is the energy obtained by the molecules of a substance due to their motion.
When phase change such as melting or boiling takes place then it means heat is absorbed by the substance. As a result, their molecules more even more rapidly from one place to another due to which more number of collisions take place.
Hence, a change in phase of substance occurs as kinetic energy increases in melting or boiling process.
Thus, we can conclude that during a phase change, such as melting or boiling, the kinetic energy increases.
______ gas is used in gas filled windows to improve thermal performance. A ) Argon B ) Nitrogen C ) Hydrogen D ) Carbon dioxide.
Answers
Answer:
Argon
Explanation:
Argon is the gas that is used most often by window manufacturers to displace the air between the panels in windows. Argon is non-toxic, inert, clear, and odorless. Its thermal conductivity is roughly 67% that of air and it’s inexpensive, making it an attractive gas fill
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What gas law states that volume and pressure are inversely proportional, while directly proportional to temperature when moles are held constant
Answers
Combined gas law states that when the number of moles of an ideal gas are held constant, the volume and pressure of the gas are inversely proportional while being directly proportional to temperature.
Under combined gas law, the three (3) main gas laws are combined together and these include:
Boyle's law.Charles' law.Gay-Lussac's law.Mathematically, the combined gas law is given by the formula:
\(\frac{PV}{T} =k\\\\\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\)
Where:
P is the pressure of a gas.T is the temperature of a gas.V is the volume of a gas.Read more: https://brainly.com/question/21280037
What does the GOES acronym stand for?
A. Geological Open Engineering System
B. Geostationary Opertational Environmental Satellite
C. Grandma Only Eats Spagetti
Answers
Answer:
B. Geostationary Operational Environmental Satellite
Explanation:
Hope this helps!
Answer:
B
Explanation:
I’m studying it for you!
Which one of the following salts when dissolved in water will hydrolyse?
Answers
Option c) NH4Cl will hydrolyze when dissolved in water.
Hydrolysis is a chemical reaction that occurs when a salt reacts with water, resulting in the formation of an acidic or basic solution. In this case, when NH4Cl (ammonium chloride) is dissolved in water, it undergoes hydrolysis.
The ammonium ion (NH4+) is the conjugate acid of ammonia (NH3), which is a weak base. When NH4Cl dissociates in water, the ammonium ion reacts with water to form NH3 and H3O+ (hydronium ion). This process is called hydrolysis.
NH4+ (aq) + H2O (l) ↔ NH3 (aq) + H3O+ (aq)
The formation of NH3 leads to an increase in the concentration of hydroxide ions (OH-) in the solution, making it slightly basic. At the same time, the presence of H3O+ ions makes the solution slightly acidic. Therefore, the hydrolysis of NH4Cl results in a slightly acidic and slightly basic solution.
In contrast, salts like NaCl and KCl do not undergo hydrolysis when dissolved in water because they consist of cations (Na+ and K+) and anions (Cl-) that do not react with water to form acidic or basic species.
Na2SO4 (sodium sulfate) is also an example of a salt that does not undergo hydrolysis. The sulfate ion (SO42-) does not react with water to form acidic or basic species, so the solution remains neutral.
Therefore, among the given options, only NH4Cl undergoes hydrolysis when dissolved in water.
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The question is incomplete. Find the full content below:
Which one of the following salts when dissolved in water will hydrolyse?
a) NaCl
b) KCl
c) NH4Cl
d)Na2SO4
A pie can be cut into eight slices. What is the minimum number of pies you would need if you were to serve a slice of pie with each cup of hot chocolate in item 6? How many slices of pie would be left over?
Answers
(a) We would need 7 pies to serve a slice of pie with each cup of hot chocolate.
(b) There would be 6 slices of pie left over.
What is number of pies that will be left over?From item 6, we know that there are 50 cups of hot chocolate to be served.
Since each pie can be cut into 8 slices, we would need to serve 50/8 = 6.25 pies.
Since we cannot serve a fractional pie, we would need to round up to the next whole number of pies, which is 7.
To find out how many slices of pie would be left over, we need to calculate the total number of slices of pie and subtract the number of slices used to serve the hot chocolate.
Total number of slices of pie = 7 pies x 8 slices per pie = 56 slices
Number of slices used to serve the hot chocolate = 50 slices
Therefore, the number of slices of pie left over would be:
56 slices - 50 slices = 6 slices
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A patient has the following ABG results: pH 7.25, PaCO2 43, PaO2 80, SaO2 91%, and HCO3- 18. What is the most likely underlying cause?
Answers
The most likely underlying cause of the abnormal ABG values is a metabolic acidosis.
Based on the provided ABG (arterial blood gas) results, the patient's pH is 7.25, indicating acidemia (low blood pH). The PaCO₂ (partial pressure of carbon dioxide) is 43, which is within the normal range (35-45 mmHg), indicating normal or compensated respiratory function. The PaO₂ (partial pressure of oxygen) is 80, which is slightly lower than the normal range but still within an acceptable range.
The SaO₂ (arterial oxygen saturation) is 91%, indicating adequate oxygen saturation. Lastly, the HCO₃⁻ (bicarbonate) level is 18, which is below the normal range (22-28 mEq/L), indicating a low level of bicarbonate.
Given these results, the most likely underlying cause of the abnormal ABG values is a metabolic acidosis. A low pH combined with a low bicarbonate level suggests an imbalance in the body's acid-base regulation, specifically a decrease in bicarbonate which leads to an excess of acids. This could be caused by conditions such as diabetic ketoacidosis, lactic acidosis, renal failure, or severe diarrhea, among others.
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what is burning considered ?
A. physical change
B.chemical change
C.none of the above
D.all of the above
Answers
Which phrase describes air density?
A. increases as altitude increases
B. equals mass divided by volume
C. pushes molecules in one direction
D. exerts less pressure as it increases
Answers
Answer:
c i think
Explanation:
A scientist produces zinc iodide (zni2). (a) calculate the minimum mass of zinc that needs to be added to 0.500 g of iodine so that the iodine fully reacts. the equation for the reaction is: zn + i2 ⟶ zni2 relative atomic masses (mr): zn = 65 i = 127
Answers
The minimum mass of Zinc, Zn that needs to be added to 0.500 g of iodine so that the iodine fully reacts is 0.128 g
Balanced equationZn + I₂ —> ZnI₂
Molar mass of Zn = 65 g/mol
Mass of Zn from the balanced equation = 1 × 65 = 65 g
Molar mass of I₂ = 127 × 2 = 254 g/mol
Mass of I₂ from the balanced equation = 1 254 = 254 g
SUMMARY
From the balanced equation above,
254 g of I₂ required 65 g of Zn
How to determine the mass of Zn neededFrom the balanced equation above,
254 g of I₂ required 65 g of Zn
Therefore,
0.5 g of I₂ will require = (0.5 × 65) / 254 = 0.128 g of Zn
Thus, the minimum mass of Zn required is 0.128 g
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a solution was prepared by dissolving 105.0 g of kcl in 215 g of water. what is the molality (in m) of kcl in this solution?
Answers
Considering the definition of molality, the molality of the KCl in the solution is 6.56 moles/kg.
Molality, or molal concentration, is the amount of a substance dissolved in a given mass of solvent. It is defined as the moles of a solute per kilogram of solvent.
The Molality of a solution is determined by the expression:
molality= number of moles of solute÷ kilograms of solvent
Molality in this case
In this case, you know:
mass of KCl= 105 g
mass molar of KCl= 74.55 g/mole
number of moles of solute= mass of KCl÷ mass molar of KCl= 105 g÷ 74.55 g/mole= 1.41 moles
Mass of solvent = 215 g of water= 0.215 kg (being 1000 g=1 kg)
Replacing in the definition of molality:
Molality= 1.41 moles÷ 0.215 kg
Molality= 6.56 moles/kg
The molality of the solution is 6.56 moles/kg.
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In the molecule 4H2O2 the number of hydrogen atoms is what
Answers
4H2 actually means
\(4H_{2}\)
Answer:
Scientists
Explanation:
Scientists because they are the one who makes hypothesis.
How does decreasing the temperature of a solid affect the motion of the
particles in the solid?
Answers
Answer:
The particles in the solid move slower.
Explanation:
The decline in kinetic energy from decreasing the temperature results in slower moving particles.
how is thermal energy apart of weather changing
Answers
Answer:
Heat, in the form of thermal energy, naturally moves from warmer substances to colder ones. When the ocean is warmer than the atmosphere, it transfers heat — through conduction and radiation — to make the air warmer. ... This redistributes thermal energy and causes changes in the weather.
the pka of phosphoric acid is 7.21. what is the useful buffering range of this acid and its conjugate base? briefly, explain.
Answers
To answer your question, the useful buffering range of phosphoric acid and its conjugate base is approximately between pH 6.21 to 8.21.
This is because the pKa of phosphoric acid is 7.21, which means that at pH values below 6.21, most of the acid will be in its protonated form (H3PO4) and at pH values above 8.21, most of it will be in its deprotonated form (H2PO4-). However, within this buffering range, there will be a relatively equal distribution of both the protonated and deprotonated forms,
which allows for the acid-base pair to act as an effective buffer. The buffer capacity is the highest at pH = pKa and decreases as the pH moves away from pKa. The conjugate base of phosphoric acid is H2PO4-, and it acts as the base in the buffer system. In summary, the useful buffering range of phosphoric acid and its conjugate base is between pH 6.21 to 8.21, which allows for the acid-base pair to act as an effective buffer.
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complete combustion of 2.00 g2.00 g of a hydrocarbon produced 6.16 g6.16 g of co2co2 and 2.84 g2.84 g of h2o.h2o. what is the empirical formula for the hydrocarbon? insert subscripts as necessary. empirical formula:
Answers
The molecular formula of a compound is a whole number multiple of its empirical formula. The empirical formula of the hydrocarbon is C₄H₉.
What is empirical formula?The empirical formula of a compound can be defined as the formula which gives the simplest whole number ratio of atoms of various elements present in one molecule of the compound.
Here moles of 'C' = moles 'CO₂' = 6.16 / 44 = 0.14 moles
Moles of 'H' = 2 × moles 'H₂O' = 2 × 2.84/18.02 = 0.315 moles
Divide both number of moles by 0.14. Then we get
1 mol 'C' and 2.25 mol 'H'
Multiply both with 4 to obtain a whole number.
Then the number of carbon is 4 and that of hydrogen is 9.
Thus the empirical formula is C₄H₉.
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A 5.0g sample of Cu(NO3)2•nH2O is heated, and 3.9g of the anhydrous salt remains. what is the value for n?
Answers
Answer: 2.9
Explanation:
Molar mass of Cu(NO3)2 = 187.5 g/mol
Molar mass of water = 18.0 g/mol
%H2O = (5.0 g - 3.9 g) / 5.0 g X 100 (100 is to get percent) = (1.1 g) / 5.0 g X 100
= 22.0 %
% H2O = ( mass of H20 alone) / (mass of total hydrate)
0.22 = 18.0n / (18.0n + 187.5)
n = 2.9 = (about) 3
When a 5.0g sample of Cu(NO₃)₂ . nH₂O is heated, and 3.9g of the anhydrous salt remains. The value of n is 3.
How to find the the amount of water lost ?Water mass = Hydrate mass - Anhydrous mass
= 5.0 - 3.9
= 1.1 g water
How to find the number of moles ?Number of moles = \(\frac{\text{Given mass}}{\text{Molar mass}}\)
Now find the moles of H₂O and moles of Cu(NO₃)₂.
Moles of H₂O = \(\frac{\text{Mass of water}}{\text{Molar mass of water}}\)
= \(\frac{1.1\ g}{18\ g/mol}\)
= 0.061 moles
Moles of Cu(NO₃)₂ = \(\frac{\text{Mass of}\ Cu(NO_{3})_{2}}{\text{Molar mass of}\ Cu(NO_{3})_{2}}\)
= \(\frac{3.9\ g}{187.5\ g/mol}\)
= 0.0208 moles
Ratio of moles of H₂O and moles of Cu(NO₃)₂.
= \(\frac{0.061}{0.0208}\)
= 2.9
≈ 3
The value of n is 3. So the formula will be Cu(NO₃)₂ . 3H₂O.
Thus, from above conclusion we can say that when a 5.0g sample of Cu(NO₃)₂ . nH₂O is heated, and 3.9 g of the anhydrous salt remains. The value of n is 3.
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Copper exists in nature as two isotopes. The atomic masses and relative abundance of these isotopes is given in the table. What is the average atomic mass of copper? A. 62. 93 amu B. 63. 55 amu C. 63. 935 amu D. 64. 94 amu E. 127. 87 amu.
Answers
The average atomic mass of copper is 63.55.
The correct option is B. 63. 55
What is copper?Copper is a chemical element with the symbol Cu. This is a metal that is a ductile, malleable, and good conductor of electricity.
Now,
The two isotopes of copper are:
63Cu with the isotopic mass 62.93
65Cu, with an isotopic mass of 34.93
63Cu has a 69.2% abundance.
65Cu has 30.8% abundance.
The average atomic mass of Cu will be
62.93×69.2% + 64.93×30.8% = 63.55 amu.
Thus, the average atomic mass of copper is 63.55.
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What is the frequency of a red laser that has a wavelength of 676 mn
Answers
The frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.
Frequency of wavesThe frequency and wavelength of a wave are related by the following equation:
λf = c
Where λ is the wavelength of the wave in meters, f is the frequency in Hertz, and c is the speed of light in a vacuum.
in this case, λ = 676 nm = 6.76 x \(10^{-7\) m
c = 299,792,458 m/s
Making f the subject of the formula:
f = c/λ
= 299,792,458/6.76 x \(10^{-7\)
= 4.43 x \(10^{14\) hertz
In other words, the frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.
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During which process would the ratio of uranium 238 to lead 206 be used?
Answers
Answer: The ratio of the amounts of U 238 and Pb 206 in a rock sample enables the age of the rock to be estimated using the technique of radiometric dating. It moves back in the periodic table until the isotope falls in the band of stability at Pb 206.
Explanation: