Question

A hot air balloon has a volume of 3.𝑔80 x 105 L at 42 °C and a pressure of 754 mm Hg. If the average molar mass of air is 29.0 𝑚𝑜𝑙, what is the mass of air, in grams, in the balloon?

Answer 1

Use PV = nRT and solve for n = numer of mols air. Then grams air = mols air x molar mass air.