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A weather forecasting plastic balloon of...

A weather forecasting plastic balloon of volume `15m^3` contains hydrogen of density `0.09(kg)/(m^3`. The mass of the empty balloon is 7.15kg Calculate (a) the mass of hydrogen in the balloon (b) the mass of the balloon filled with hydrogen.

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(a) mass of hydrogen, `M=Vxxd=(15m^3)(0.09(kg)/(m^3))=1.35kg`
(b) mass of balloon filled with hydrogen`=1.35kg+7.15kg=8.50kg`
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