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?
- anonymousLv 77 years agoFavorite Answer
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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