Refer to Exercise 43, and determine the minimum temperature to which the balloon described in part (b) would have to be heated before it could begin to rise in air.

Exercise 43

In order for a gas-filled balloon to rise in air, the density of the gas in the balloon must be less than that of air.

(a) Consider air to have a molar mass of 28.96 g/mol; determine the density of air at 25 °C and 1.00 atm, in g/L.

(b) Show by calculation that a balloon filled with carbon dioxide at 25 °C and 1 atm could not be expected to rise in air at 25 °C.