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A hot air balloon starts to take off when the temperature inside the balloon is 111...

A hot air balloon starts to take off when the temperature inside the balloon is 111 °C higher than the outside air. The pressure is the same inside and outside the balloon and there is a total of 2.50× 105 moles of air in the balloon. Assuming that the air density outside of the balloon is 1.20 kg/m3, what is the total mass of the balloon and its load?

The answer is 2.73 × 103 kg. I am not sure that how to get there tho. Any help would be great Thanks.

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