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For the chemical reaction:                                2 HNO2 + N2O → 4 NO + H2O Is found to...

For the chemical reaction:                                2 HNO2 + N2O → 4 NO + H2O

Is found to be second order with respect to N2O and zero order with respect to HNO2.

2 N2O → N2 + 2 NO                                         (slow)                    I

                N2 + HNO2 → N2O + HNO                             (fast)                     II

                HNO + HNO2 → H2O + 2 NO                       (fast)                    III

Is this mechanism valid?

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Answer #1

Rate depends on the slowest step.
Here 1st step is slowest.
So, the rate law is dependent on 1st step.
In 1st step were are 2 N2O reacting.
So, it is 2nd order with respect to N2O and 0 order with respect to other reactants.

So, yes the mechanism is valid

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