Answer:
.926 moles
Explanation:
Rounding :
H2 0 = 18 gm/mole
50 gm would then be 50 / 18 = 2.7777 moles of water
every two moles of 2 C6H6 produces 6 moles of water
2.7777/6 * 2 = .926 moles
A buffer system is set up with [A] = 1.5[HA ]. If pKa = 5.4, what is the pH of the buffer?
5.57 is the pH of the buffer .
What is buffer ?
Buffer, in chemistry, usually a solution containing acids and bases or salts that tends to maintain a constant concentration of hydrogen ions. An ion is an atom or molecule that has lost or gained one or more electrons. A common buffer is a solution of acetic acid (CH3COOH) and sodium acetate. In aqueous solution, sodium acetate completely dissociates into sodium (Na+) and acetate (CH3COO-) ions. Buffer solutions with different hydrogen ion concentrations can be prepared by varying the buffer ratio and choosing acids of appropriate intrinsic strength. Commonly used buffers include phosphate, citrate, or borate and their salts
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Which lava contains a lot of water
Answer:
i think its magma ajani i looked it up... and chelsey said u had corona so if its true hope u get better bro
Explanation:
Given the reaction: Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
The reaction occurs more rapidly when a 10-gram sample of Mg is powdered rather than in one piece, because powdered
Mg has
1. less surface area
2. more surface area
3. a lower potential energy
4. a higher potential energy
At a certain temperature this reaction follows first-order kinetics with a rate constant of 2.01 s^−1
CICH2CH2Cl (g) → CH2CHCI (g) + HCl(g)
Suppose a vessel contains CICH2CH2Cl at a concentration of 1.34 M. Calculate how long it takes for the concentration CICH2CH2Cl to decrease to 20.0% of its initial value. You may assume no other reaction is important. Round your answer to 2 significant digits.
Answer:
0.80 seconds (2 significant figures)
Explanation:
The equation of the reaction is given as;
CICH2CH2Cl (g) --> CH2CHCI (g) + HCl(g)
Rate constant (k) = 2.01 s^-1
From the units of the rate constant, this is a first order reaction.
Initial Concentration = 1.34 M
t = ?
Final concentration = 20% of 1.34 = 0.268 M
The integrated rate law for a first order reaction is given as;
ln[A] = ln[A]o - kt
ln(0.268) = ln(1.34) - 2.01(t)
-2.01(t) = - 1.6094
t = 0.8007 ≈ 0.80 seconds (2 significant figures)
Help me please.
How do animals see their pray without light?
Answer:Many nocturnal animals have a mirror-like layer, called the tapetum, behind the retina, which helps them make the most of small amounts of light.
Explanation:
How to make isopropyl alcohol
Answer:
.It is easily synthesized from the reaction of propylene with sulfuric acid, followed by hydrolysis. Isopropyl alcohol (2-propanol) is made by indirect hydration of propylene (CH2CHCH3).… In some cases the hydration of propylene is carried out in one step, using water and a catalyst at high pressure.
Hope it'll help!
stay safe:)
Inter conversion of glucose and fructose occurs with an eqilibrium constant of 1.0. glicose isomerase catalyzes this reaction. The final concentration of fructose at equilibrim from 40 mM glucose is .
Inter-conversion of glucose and fructose occurs with an equilibrium constant of 1.0. Glucose isomerase catalyzes this reaction. The final concentration of fructose at equilibrium from 40mM glucose is a. 40 mM.
How to find the final concentration of fructose?Using this formula to find the final concentration of fructose
Final concentration of fructose =Equilibrium from glucose/ Equilibrium constant
Where:
Equilibrium constant = 1.0
Equilibrium from glucose = 40 mM
Let plug in the formula
Final concentration of fructose = 40mM / 1.0
Final concentration of fructose = 40mM
Therefore we can conclude that the correct option is A.
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The complete question is:
Inter-conversion of glucose and fructose occurs with an equilibrium constant of 1.0. Glucose isomerase catalyzes this reaction. The final concentration of fructose at equilibrium from 40mM glucose is
a. 40 mM
b. 20 mM
c. 10 mM
d. 0 mM
How many liters of carbon dioxide gas are produced from 0.012 moles oxygen and excess propane at STP? 1 C3H8 (g) + 5 O2 (g) → 3 CO2 (g) + 4 H2O (g) ______ Liters CO2
Answer:
0.16 L
Explanation:
Step 1: Write the balanced equation
C₃H₈(g) + 5 O₂(g) → 3 CO₂(g) + 4 H₂O(g)
Step 2: Calculate the moles of CO₂ produced from 0.012 moles of O₂
The molar ratio of O₂ to CO₂ is 5:3. The moles of CO₂ produced are 3/5 × 0.012 mol = 0.0072 mol.
Step 3: Calculate the volume occupied by 0.0072 moles of CO₂ at standard temperature and pressure
At STP, 1 mole of CO₂ occupies 22.4 L.
0.0072 mol × 22.4 L/1 mol = 0.16 L
Lavasha's backpack holds up to 14.75 kilograms. What is this mass expressed in grams?
O 14750 g
0.01475 g
1.475 g
O 1475 g
The mass expressed in grams was 0 14750 g.
what is a gram?
A gram is the SI unit of weight in the metric system, and it is frequently abbreviated as "g."A common unit of mass or weight is the pound.Using this metric, we can convert grams to kilograms.The metric units of mass or weight are kilogram and gram.The global measurement norm is the International System of Units (SI), sometimes referred to as the metric system.The definition temperature (0 °C), which was originally altered to 4 °C, the temperature of maximum density of water, was first used in 1795 as "the absolute weight of a volume of pure water equal to the cube of the hundredth part of a metre and at the temperature of melting ice."To learn more about gram refer to
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In order to separate water into the elements of hydrogen and oxygen, a chemical change must take place. This suggests that water is:
a) an element b) a pure substance c) a mixture D) heterogeneous
Answer:
D
Explanation:
heterogeneous
.of or denoting a process involving substances in different phases (solid, liquid, or gaseous).
What is the purpose of the arrow in a chemical equation?
The arrow in a chemical equation represents the direction of the reaction. It indicates the conversion of reactants into products. The arrow points from the reactant side to the product side, symbolizing the flow of the reaction.
The purpose of the arrow is to visually represent the chemical transformation occurring in the reaction. It shows the relationship between the reactants and products and the direction in which the reaction proceeds. The arrow implies that the reactant molecules are being rearranged and transformed into new substances with different properties.
Chemical equations are used to describe the stoichiometry and balance of reactions. The arrow helps convey this information by illustrating the overall process taking place. It serves as a crucial element in understanding the reaction's composition, reaction conditions, and the substances involved.
Furthermore, the arrow also implies that the reaction can occur in both directions. In reversible reactions, the arrow can be represented as a double-headed arrow, indicating that the reaction can proceed in either direction depending on the conditions.
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(1.6): What volume of oxygen, at 18°C and 750 torr, can be
obtained from heating 100gm of potassium chlorate, KCIO,?
Answer:
Volume of oxygen obtained = 30 L
Explanation:
Given data:
Mass of KClO₃ = 100 g
Pressure = 750 torr = 750/760 = 0.98 atm
Temperature = 18°C = 18+273 = 291 K
Volume of oxygen obtained = ?
Solution:
Chemical equation:
2KClO₃ → 3O₂ + 2KCl
Number of moles of KClO₃:
Number of moles = mass/molar mass
Number of moles = 100 g/ 122.55 g/mol
Number of moles = 0.82 mol
Now we will compare the moles of KClO₃ with oxygen.
KClO₃ : O₂
2 : 3
0.82 : 3/2×0.82 = 1.23 mol
Volume of oxygen:
PV = nRT
0.98 atm × V = 1.23 mol ×0.0821 atm.L/mol.K × 291 K
0.98 atm × V = 29.4 atm.L
V = 29.4 atm.L /0.98 atm
V = 30 L
How many moles of SO2 will be produced from 11.5 moles of O2?
Explanation:
Respuesta: La masa atómica del carbono (C) es 12 g/mol; para el oxígeno (O) es de 16 g/mol. Esto significa que 6.022 x 1023 átomos de carbono pesan 12 gramos. Según esto, el peso molecular del CO2 es: 12 g/mol [C] + 2 x 16 g/mol [O2] = 44 g/mol
Physical methods of monitoring the rate of a chemical reaction
There are several physical methods that can be used to monitor the rate of a chemical reaction are; Spectrophotometry, Conductometry, and Turbidity measurement
Spectrophotometry involves measuring the changes in the intensity of light absorbed or transmitted by a solution during a chemical reaction. Spectrophotometers are used to measure the amount of light absorbed or transmitted by a sample at different wavelengths.
Conductometry involves measuring the changes in electrical conductivity of a solution during a chemical reaction. Conductivity meters are used to measure the electrical conductivity of a solution, which can change as the concentration of ions in the solution changes during a chemical reaction.
Turbidity measurement involves measuring the changes in the clarity or turbidity of a solution during a chemical reaction. Turbidimeters or nephelometers can be used to measure the amount of light scattered by a sample, which can change as particles form or dissolve during a reaction.
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--The given question is incomplete, the complete question is
"What are the physical methods of monitoring the rate of a chemical reaction?"--
Which mineral might scratch the mineral fluorite, but would not scratch the mineral amphibole? 1 brucite 2. magnesite 3. carnallite 4. olivine
Answer:
olivine i think
Explanation:
why did my dad hasn't come back with the milk for 10 years
Answer:
Milk's heavy
Explanation:
A propane tank when first filled reads 175. psi. After 1 month of use, the propane tank reads 81. psi.
Note: Reference the Conversion factors for non-SI units table for additional information.
Part 1 of 2
Convert the tank pressure when first filled to mmHg. Be sure your answer has the correct number of significant figures.
m
175. ps1=
mmHg
Answer:
After 1 month of use, the propane tank reads 81
Explanation:
A fuel tank holds 22.3 gallons of gasoline. If the density is 0.8206 g/mL, what is the mass in kilograms of gasoline in a full tank
Answer:
\(m=69.3kg\)
Explanation:
Hello!
In this case, since the density is computed by dividing the mass of the substance by its occupied volume (d=m/V), we first need to realize that 0.8206 g/mL is the same to 0.8206 kg/L, which means we first need to compute the volume in L:
\(V=22.3gal*\frac{3.78541L}{1gal}=84.415L\)
Then, solving for the mass in d=m/V, we get m=d*V and therefore the mass of gasoline in that full tank turns out:
\(m=0.8206g/L*84.415L\\\\m=69.3kg\)
Best regards!
If ionization energy of hydrogen atom is 13.6 eV then its ionization potential will be
Ionization potential and ionization energy are two terms used to describe the same thing.
The ionization potential of hydrogen atom is 13.6 eV
The ionization potential is the energy that is required to remove an electron from the neutral atom. It is the same as the ionization energy.
From the question, we can see that the ionization energy of the hydrogen atom is 13.6 eV, it also means that the ionization potential of the hydrogen atom is also 13.6 eV.
Therefore, If ionization energy of hydrogen atom is 13.6 eV then its ionization potential will be 13.6 eV
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how do one get this solution
-log10 (2* 10^-2)
The result of the computation when you follow the steps is 1.699.
A logarithm is a mathematical function that represents the exponent or power to which a specific base must be raised to obtain a given number. In simpler terms, it answers the question: "To what power must we raise a base number to obtain a certain value?"
What you should do is that on your calculator, you could press the logarithm key and then put in the value that has been shown and then the result would be displayed on your calculator.
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Local winds can be caused by______heating of the earth's surface.
equal
ground
uneven
super
Determine the total kilojoules in two tablespoons
The total kilojoules in two tablespoons is 836.8 kJ.
To determine the total kilojoules in two tablespoons of a substance, we need to know the specific substance and its energy content per tablespoon. Different substances have different energy values, so without this information, it is not possible to provide an accurate calculation.
The energy content of food or substances is typically measured in kilocalories (kcal) or kilojoules (kJ). 1 kilocalorie is equal to 4.184 kilojoules. The energy content of a substance is often listed on food labels or in nutritional databases.
For example, if we have the energy content of a substance as 100 kilocalories (kcal) per tablespoon, we can convert it to kilojoules by multiplying it by 4.184:
100 kcal * 4.184 kJ/kcal = 418.4 kJ
So, if we have two tablespoons of this substance, the total energy would be:
418.4 kJ/tablespoon * 2 tablespoons = 836.8 kJ
It's important to note that the energy content of a substance can vary depending on its composition, density, and other factors. Therefore, it is always recommended to refer to reliable sources such as food labels, nutritional databases, or consult a qualified professional to obtain accurate information regarding the energy content of specific substances.
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You titrate 234.0 mL of a 0.444 M sodium hydroxide solution with 100.0 mL of an unknown concentration sulfuric acid solution. What is the molarity of H2SO4? Show work
The molarity of the sulfuric acid solution used in the titration is 1.038 M.
How to calculate molarity?Molarity is the concentration of a substance in solution, expressed as the number of moles of solute per litre of solution.
Molarity of a solution involved in titration can be calculated using the following expression;
CaVa = CbVb
Where;
Ca = acid concentrationVa = acid volumeCb = base concentrationVb = base volumeAccording to this question, 234.0 mL of a 0.444 M sodium hydroxide solution is titrated with 100.0 mL of an unknown concentration sulfuric acid solution.
100 × Ca = 234 × 0.444
100Ca = 103.87
Ca = 1.038 M.
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Starting with 0.3500 mol CO(g) and 0.05500 mol COCl2(g) in a 3.050 L flask at 668 K, how many moles of CI2(g) will be present at equilibrium?
CO(g) + Cl2(g)》COCl2(g)
Kc= 1.2 x 10^3 at 668 K
At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.
1: Write the balanced chemical equation:
\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)
2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.
Initial:
\(C_O\)(g) = 0.3500 mol
\(Cl_2\)(g) = 0.05500 mol
\(C_OCl_2\)(g) = 0 mol
Change:
\(C_O\)(g) = -x
\(Cl_2\)(g) = -x
\(C_OCl_2\)(g) = +x
Equilibrium:
\(C_O\)(g) = 0.3500 - x mol
\(Cl_2\)(g) = 0.05500 - x mol
\(C_OCl_2\)(g) = x mol
3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:
Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]
4: Substitute the given equilibrium constant (Kc) value into the expression:
1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)
5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:
1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x
6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.
7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.
8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):
\(Cl_2\)(g) = 0.05500 - x
9: Calculate the value of \(Cl_2\)(g) at equilibrium:
\(Cl_2\)(g) = 0.05500 - x
\(Cl_2\)(g) = 0.05500 - (positive value of x)
10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.
Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.
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which choice is not an example of a molecule
Mn
O3
KOH
H2S
Answer:
The answer to your question is A | Mn
Calculate the mass percent of oxygen in lead(II) nitrate. Round your answer to the nearest percentage.
Answer: 29%
Explanation:
Mass percent is a means to describe a component in a specific combination or to convey a concentration. The mass percentage used to describe the solution composition indicates the mass of solute contained in a given mass of solution. Here the mass percent of 'O' is 4.82%.
The solute's concentration is specified in terms of mass or moles. The mass percent of a solution is calculated by multiplying the grams of solute per gram of solution by 100 to get the percentage.
The equation used to calculate the mass percentage is:
Mass of lead(II) nitrate = 331.2 g/mol
Mass of 'O' = 15.99 g
Mass% = Mass of component / Total Mass of compound × 100%
Mass% = 15.99 / 331.2 × 100% = 4.82%
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Which of the following is NOT necessary for chemical equilibrium?
*
1 point
a closed system
reactants and products that are the same state of mater
the rate of the forward reaction matches the rate of the reverse reaction
a reversible chemical reaction
reactants and products that are the same state of matter
An atomic emission spectrum of hydrogen shows three wavelengths:
121.5 nm,102.6 nm, and 97.23 nm
Assign these wavelengths to transitions in the hydrogen atom.
Drag the appropriate items to their respective bins.
We have that wavelengths to transitions in the hydrogen atom.
\(nf=2,ni=1 \rightarrow 121.5nm\\\\ni=1,nf=3 \rightarrow 102.6nm\\\\\ni=1,nf=4 \rightarrow 97.2nm\)
From the question we are told that
121.5 nm,102.6 nm, and 97.23 nm
Generally the equation for wavelength is mathematically given as
\(\frac{1}{\lambda}=R_H*(\frac{1}{nf^2}-\frac{1}{nf^2})\\\\\frac{1}{\lambda}=1.097*10^7*\frac{1}{nf^2}-\frac{1}{ni^2}\)
Therefore
For nf=2,ni=1
\(\frac{1}{\lambda}=1.097*10^7*\frac{1}{2^2}-\frac{1}{1^2}\\\\\frac{1}{\lambda}=121.5nm\)
For ni=1,nf=3
\(\frac{1}{\lambda}=1.097*10^7*\frac{3}{1^2}-\frac{1}{1^2}\\\\\frac{1}{\lambda}=102.6nm\)
For ni=1,nf=4
\(\frac{1}{\lambda}=1.097*10^7*\frac{1}{4^2}-\frac{1}{1^2}\\\\\frac{1}{\lambda}=97.2nm\)
Therefore
The Correct slots are
\(nf=2,ni=1 \rightarrow 121.5nm\\\\ ni=1 ,nf = 3 \rightarrow 102.6nm\\\\\ni=1,nf=4 \rightarrow 97.2 nm\)
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What is the average atomic mass of 10 hydrogen -1 molecules?
Answer:
1.674 x 10^-23 grams
Explanation:
Hydrogen-1 is called Protium
wikipedia
atomic mass of Protium is 1.00794 amu
sciencedirectcom
atomic mass of 10 Protiums is 10.0794 amu
10.0794 amu in grams is
1.6737236x10^-23 grams
A student inflates a balloon with helium then places it in the freezer. The student should expect
the balloon's volume to increase
the balloon's volume to decrease
the balloon's moles to decrease
the balloon's moles to increase