A hot air balloon with diameter 20 m initially contains air at STP on a cool September morning. When the air is heated to 70 degree C , what mass of air is pushed out of the balloon? This is roughly the mass which can then be lifted by the balloon. (Potentially useful information: The molar mass of air is about 30 g/mol . The surface area and volume of a sphere are A = 4pi r 2 and V = 4 pi r 3 .)

A hot air balloon with diameter 20 m initially contains air at STP on a cool September morning. When the air is heated to 70 degree C , what mass of air is pushed out of the balloon? This is roughly the mass which can then be lifted by the balloon. (Potentially useful information: The molar mass of air is about 30 g/mol . The surface area and volume of a sphere are A = 4pi r 2 and V = 4 pi r 3 .)

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