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Multiple Choice
What is the rate law for the elementary reaction 2 HCl → H2 + Cl2?
A
Rate = k[HCl]^2
B
Rate = k[HCl]
C
Rate = k[H2][Cl2]
D
Rate = k[H2][Cl2]^2
Verified step by step guidance
1
Identify that the reaction given is an elementary reaction: 2 HCl → H2 + Cl2.
Understand that for an elementary reaction, the rate law can be directly written from the stoichiometry of the reactants.
Note that the stoichiometric coefficient of HCl in the reaction is 2, which means the rate of the reaction is proportional to the concentration of HCl raised to the power of 2.
Write the rate law expression based on the stoichiometry: Rate = k[HCl]^2, where k is the rate constant.
Recognize that the other options provided do not match the stoichiometry of the reactants in the elementary reaction, confirming that Rate = k[HCl]^2 is the correct rate law.