You have a helium balloon at 1.00 atm and 25_C. You want

Chapter , Problem 123

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You have a helium balloon at 1.00 atm and 25_C. You want tomake a hot-air balloon with the same volume and same lift asthe helium balloon. Assume air is 79.0% nitrogen, 21.0% oxygenby volume. The lift of a balloon is given by the difference betweenthe mass of air displaced by the balloon and the mass ofgas inside the balloon.a. Will the temperature in the hot-air balloon have to be higheror lower than 25_C? Explain.b. Calculate the temperature of the air required for the hot-airballoon to provide the same lift as the helium balloon at 1.00atm and 25_C. Assume atmospheric conditions are 1.00 atmand 25_C.

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