Anonymous
Anonymous asked in Education & ReferenceHomework Help · 7 years ago

A 5.00 L sample of a gas has a mass of 2.00 g at STP. What is the molar mass of this gas?

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  • 7 years ago
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    At STP, 1 mole of any gas has volume 22.4 liters. Use this to figure out the number of moles of gas present:

    (5.00 L) x (1 mole / 22.4 L) = 0.223 moles

    then the molar mass of the gas would be

    (2.00 g / 0.223 moles) = 8.97 g / mole

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