# What is the rate expression for decomposition of $\ce{H2O2}$ in the presence of a catalyst?

What is the rate expression for decomposition of $$\ce{H2O2}$$ in the presence of a catalyst?

As far as I know for catalase, it is like this: $$\ce{Rate = k[H2O2][Catalase]}$$

I don't know what it is for the catalysts $$\ce{MnO2}$$ and $$\ce{Fe2O3}$$. Another question in my mind is that even if it's similar to that of catalase, since these are powdered and so do not have a concentration, how can I express it?

It is kind of emergency so any help would be greatly appreciated.

$$\ce{2H2O2 + Catalyst ->2H2O + O2}$$

I found on web that both reactions are probably (still not sure even though I saw it) first order reactions.

Edit: Is it possible that there shouldn't be anything to be added and it will only affect the $$\mathrm{k}$$?

• Don't use MathJax or LaTeX in tiles. Don't use \ce{} for rate constants, use \mathrm{} instead. – Zenix Apr 15 at 23:38

I don't know what it is for the catalysts $$\ce{MnO2}$$ and $$\ce{Fe2O3}$$. Another question in my mind is that even if it's similar to that of catalase, since these are powdered and so do not have a concentration, how can I express it?