Review Question. The mass of a hot-air balloon and its cargo (not including the air inside) is 204.5 kg. The air outside is at 10^oC and 101000Pa. The volume of the balloon is 407.0m³. To what temperature must the air in the balloon be warmed before the balloon will lift off? (Air density at 10^oC is 1.244 kg/m³.)

State your answer in ^oC to the nearest 0.1^oC.

Take molar mass of the "air molecule" ( weighed average of the air components) to be 29g/mole,

0^oC=273K, R=8.31J/kmole, g=9.8m/s²