206salmaa 206salmaa

24-02-2022
Chemistry

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what is the mass of a 167.8 L (at STP) sample of helium gas ?

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indrawboy indrawboy

24-02-2022

1 mole at STP = 22.4 L

167.8 : 22.4 = 7.49 mole

mass = mole x Ar He

mass = 7.49 x 4 g/mol = 29.96 g

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