please solve each part

A 200dm3 constant volume batch reactor is pressurized to 20atm with a mixture of 75% A and 25% inert. The gas phase reaction is carried out isothermally at 227C. a. Assuming that the ideal gas law is valid, how many moles of A are in the reactor initially? What is the initial concentration of A? b. If the reaction is first order with the following rate expression: rA=kCA with k=0.1min1 Calculate the time required to convert 88% of A a. If the reaction is second order with the following rate expression: rA=kCA2 with k=0.7dm3/(molmin) Calculate the time to covert 80% of A