Urgent!

Considering the following equation. Na2Co3(s)+H3Po4(s)=>Na3Po4(s)+H2O(l)+CO2(g).
a) what's the energy amount envolved in the reaction?
b)what is the volum of the released gas?
c)what the volum of the consumed phosphate acid, considering d=1,69g/ml?

Really need to sold this guys. Thank so much who could help!!!