Determine the average rate of decomposition of h3po4 between 10.0 and 40.0 s. express your answer with the appropriate units.

Assume that we have this reaction 2H3PO4⇒ P2O5 + 3H2O

and when the rate of reaction is the speed at which the reactants can be changed and are converted into products So, according to our balanced reaction:

The rate of reaction = rate of formation of P2O5

and the rate of this reaction also = 0.5 rates of decomposition of H3PO4

∴ the rate of decomposition of H3PO4 = 2 rates of formation of P2O5

So when the rate of formation P2O5 = 2 x 10^-4 M/s

So the rate of decomposition of H3PO4 = 2 x 2 x 10^-4

= 4 x 10^-4 M/s