What is the weight of one litre of methane under standard conditions?

What is the weight of one litre of methane under standard conditions?
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Molecular formula for methane is CH4.. Then, molecular mass of methane = 12 + 4 x 1 = 16 u. 1 mole of methane = 16 g = 22.4 L at STP. Therefore, weight of one litre of methane = 16/22.4 g = 0.714 g.
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