Hello i need the resolution of this exercise with all the steps. thank you

The elementary reaction in the gas phase

2A B it takes place in a batch reactor where, in 1 hour of reaction, a conversion of A equal to 50% is obtained. Component A is charged to the reactor with an initial concentration of 0.2 mol/dm.

a) determine the kinetic constant and the units of measurement.

b) If the same reaction took place in a CSTR, what volume would be required to obtain a 50% conversion? Assume a molar flow rate of A in the feed of 500 mol/h and a concentration of A in the input of 0.2 mol/dm.