Given the following data, determine the order of reaction with respect to H2. H2(g)+ 2ICI → I2(g)+ 2HCL(g)

Experiment [H2](torr) ICI[torr] Rate(M/s)
1 250 325 1.34
2 250 81 0.331
3 50 325 0.266

First-order with respect to hydrogen.

Explanation:

Hello!

In this case, considering that the rate law of this reaction can be expressed via:

If we want to know m, the order of reaction with respect to hydrogen, we need to relate the experiments 1 and 3 in order to get rid of the pressure of ICl:

Thus, we plug in the given rates, and pressures to get:

So we can cancel wout k and 325^n:

Next we solve for m, the order of reaction with respect to hydrogen:

It means it is first-order with respect to hydrogen.

Regards!

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