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What is the density (in g/L) of hydrogen gas at 18.0 C and a pressure of 1670 psi?

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You know the density of H2 at sTP...one mole (2grams) in 22.4 liters.

density at STP is 2/22.4 g/L

so....think this out...

density2=densitySTP*1670PSI /14.6PSI *(273)/(273+18)

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