For the assumed reaction X2 + 2Y2--------> 2XY2, write the rate equation in terms of rate of disappearance of Y2. (1 mark)

For the rate equation

 X2 + 2Y2 → 2XY2

the rate equation in terms of disappearance of Y2 is written as 

 rate =  - 1/2 d[Y2] / dt

or - 1/2 d[Y2] / dt = k[X2]a[Y2]b

where k is the rate constant for the overall reaction, a is the order of the reaction with respect to X2 and b is the order of reaction with respect to Y2

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