The mass of 322 mL of hydrogen gas at 4.0 atm and –73°C is 1.21 grams. What is the density of hydrogen gas at STP?

First of all STP stands for standard temperature and pressure for anyone who is interested in the meaning of that acronym.

And the answer to the question is that the density of hydrogen gas at STP is 0.08988 g/L.

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