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?
15. Chemical Kinetics
Stoichiometric Rate Calculations
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple 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.
2:28mWatch next
Master Stoichiometric Rate Calculations with a bite sized video explanation from Jules
Start learningRelated Videos
Related Practice
Stoichiometric Rate Calculations practice set
Problem sets built by lead tutorsExpert video explanations