Problem: In experiments on the reaction 2 ICl(g) + H2(g) → I2(g) + 2 HCl(g), the following initial rate data were obtained.  What is overall order of the reaction?Experiment                ICl, M                          H2, M                          Initial Rate, M/s1                                  1.5                               1.5                               3.7x10-72                                 3.0                              1.5                               15x10-73                                 3.0                              4.5                               134x10-7A. ThirdB. SecondC. ZerothD. FourthE. First

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We're being asked to calculate for the overall order of the reaction given the following initial rate data:

2 ICl(g) + H2(g) → I2(g) + 2 HCl(g)  

Experiment                ICl, M                          H2, M                          Initial Rate, M/s
1                                  1.5                               1.5                               3.7x10-7
2                                  3.0                               1.5                               15x10-7
3                                  3.0                               4.5                               134x10-7


Recall that the rate law only focuses on the reactant concentrations. To calculate the order of the reaction with respect to each reactant, we will use the experimental data given. 

ICl

Look for the experimental data where the concentration of ICl changes while the concentration of H2 remains the same.

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Problem Details

In experiments on the reaction 2 ICl(g) + H2(g) → I2(g) + 2 HCl(g), the following initial rate data were obtained.  What is overall order of the reaction?

Experiment                ICl, M                          H2, M                          Initial Rate, M/s
1                                  1.5                               1.5                               3.7x10-7
2                                 3.0                              1.5                               15x10-7
3                                 3.0                              4.5                               134x10-7

A. Third
B. Second
C. Zeroth
D. Fourth
E. First

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