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A sealed flask contains 1 mole of hydrogen and 3 moles of helium gas at 20DC. If the total pressure is 40kPa, what is the partial pressure of the Hydrogen gas?

AND :)

The data below was obtained by a student in order to determine the percent of water in a Hydrate:

Mass of the Hydrate..............5.0gram
Mass of the Anhydrous Compound.. 3.2gram

What is the percent in the Hydrate?


  • Chemistry -

    20 kpa

  • Chemistry -

    Use Raoult's Law
    where Xa is the mole fraction (1/4) and Pt is the total pressure which is 40.
    So (1/4)40=10kPa

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