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## Homework Statement

What is the density (g/L) of hydrogen gas at 20*c & pressure of 1655psi?

## Homework Equations

d= P(Mm)/RT

Mm= molar mass

## The Attempt at a Solution

I started by converting 1655 psi to 55.31 ATM. I then converted my temperature to 293 kelvins. When I plug these figures into the above equation:d= 55.31ATM(2.016g)/(.08206)(293) and I arrive at an answer of 4.64 g/L. My books gives a value of 9.43g/L which appears to be about twice as much, but I cannot figure out where I made the wrong turn. Any help would be greatly appreciated. Thanks.

Joe