Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and the Yahoo Answers website is now in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

STP chemistry problem?

What is the partial pressure of hydrogen in a flask containing 4.00 gm hydrogen and 14.0 gm nitrogen at STP? The answer should

end up as .800 atm

1 Answer

Relevance
  • Lexi R
    Lv 7
    1 decade ago
    Favorite Answer

    convert each to moles

    moles = mass / molar mass

    moles N2 = 14.0 g / 28.02 g/mol = 0.500 moles

    moles H2 = 4.00 g / 2.016 g/mol = 2.00 moles

    the total pressure in a system = sum of partial pressure of each component gas

    So the partial pressure is proportional to the amount of the gas in the sample.

    The proportion of H2 = moles H2 / total moles

    = 2.00 moles / 2.50 moles

    = 0.8

    Thus partial pressure H2 = 0.8 x total pressure

    STP is standard temp (0 deg C) and pressure (1.00 atm)

    partial pressure H2 = 0.8 x 1.00 atm

    = 0.800 atm

Still have questions? Get your answers by asking now.