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A cubic metre of gas at normal temperature and pressure has a mass of 44.643 times the molecular weight of the gas in grams.

So a cubic metre of hydrogen is 89.3 grams while a cubic metre of CO2 is 1964 grams.

If the volume is 22.4 litres, the mass in grams equals the molecular weight.

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Q: How heavy a cubic meter of gas?
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