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A weather balloon filled with helium is launched at sea level in California on a clear...

A weather balloon filled with helium is launched at sea level in California on a clear day when the temperature is 34 °C and the atmospheric pressure is 758 torr (recall 760 torr = 1 atm). Before launch, the balloon has a volume of 100.0 L. What is the mass of helium, in grams, when the balloon is filled?

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