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Homework Help: Density of a gas

  1. Feb 8, 2010 #1
    1. The problem statement, all variables and given/known data
    What is the density (g/L) of hydrogen gas at 20*c & pressure of 1655psi?

    2. Relevant equations

    d= P(Mm)/RT

    Mm= molar mass

    3. 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.

  2. jcsd
  3. Feb 8, 2010 #2
    Recheck your psi to atm conversion.
  4. Feb 9, 2010 #3
    Ah HA! I used the conversion factor for in Hg, not psi. Thanks a bunch, sorry for the frivolous thread.

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