Textbook Question
Ammonia is manufactured in large amounts by the reaction
N2(g) + 3 H2(g) → 2 NH3(g)
(a) How is the rate of consumption of H2 related to the rate of consumption of N2?
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15. Chemical Kinetics
Stoichiometric Rate Calculations
Multiple Choice
The reaction that occurs in a Breathalyzer, a device used to determine the alcohol level in a person's bloodstream, is given below.2 K2Cr2O7 + 8 H2SO4 + 3 C2H6O → 2 Cr2(SO4)3 + 2 K2SO4 + 11 H2OIf the rate of appearance of Cr2(SO4)3 is 2.10 mol/min, what is the rate of disappearance of C2H6O?
A
4.20 mol/min
B
2.10 mol/min
C
3.15 mol/min
D
1.05 mol/min
Verified step by step guidance1
Identify the stoichiometry of the reaction from the balanced chemical equation: 2 K2Cr2O7 + 8 H2SO4 + 3 C2H6O → 2 Cr2(SO4)3 + 2 K2SO4 + 11 H2O.
Note the stoichiometric coefficients for C2H6O and Cr2(SO4)3, which are 3 and 2, respectively.
Understand that the rate of disappearance or appearance of a substance in a reaction is proportional to its stoichiometric coefficient.
Use the relationship between the rates: (Rate of disappearance of C2H6O) / 3 = (Rate of appearance of Cr2(SO4)3) / 2.
Substitute the given rate of appearance of Cr2(SO4)3 (2.10 mol/min) into the equation and solve for the rate of disappearance of C2H6O.
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