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What is the mass of 18.8 moles of helium atoms?
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What is the mass of 18.8 moles of helium atoms?

User Brad Bamford
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18.8 mol= mass of He X atomic mass
18.8 mol= mass of He X 4 g mol^-1
mass of He= (18.8 X 4)g = 75.2 g
User Wasif Khan
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