A hot air balloon made from 13.3kg material is 216m3 and the pressure is 1.0atm in a pure N2 atmosphere at 18C. Given the following equation and constants what is the mass in grams of C(s) (coal) that needs to be burned to reach neutral buoyancy?
C(s) + O2(g) --> CO2(g) dHrxn = -393kJ
Sair = 1.012 J/g*K
*Assume all the heat generated goes into the gas originally in balloon.