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A balloon originally has 0.100 moles of helium and has a volume of 0.500L. If 0.550 grams of He are added to the balloon, what

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A balloon originally has 0.100 moles of helium and has a volume of 0.500L. If 0.550 grams of He are added to the balloon, what will the new volume be, in L? (Assume temperature and pressure do not change.) A balloon is filled to a volume of 1.50L with 3.00 moles of gas at 25.0 C. With pressure and temperature held constant, what will be the volume (in L) of the balloon if 0.40 moles of gas are released

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