# Question

The mass of a hot-air balloon and its cargo (not including the air inside) is 200 kg. The air outside is at
10.0°C and 101 kPa. The volume of the balloon is 400 m3. To what temperature must the air in the balloon be heated before the balloon will lift off? (Air density at 10.0°C is 1.25 kg/m3.)

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