Hydrogen gas density calculation at 20°C and 1655 psi

[Agent M27]

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

 

[jahrollins]

Recheck your psi to atm conversion.

 

[Agent M27]

Ah HA! I used the conversion factor for in Hg, not psi. Thanks a bunch, sorry for the frivolous thread.

Joe