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Calcium metal and water produce hydrogen gas. If the volume of wet gas collected over water is 95.0 mL at 20 °C and 758 mm Hg, what is the volume of dry gas at STP conditions? (The vapor pressure of water at 20 °C is 17.5 mm Hg.)

  • chem -

    pressure dry gas=pressure wet gas-vaporpressurewater

    So you know pressuredrygas

    volumegas=95ml
    pressuregas=758-17.5
    temp: 20C

    V2*Pstp/tempstp=volumegas*pressure/temp

    where on the right side, it refers to the conditions immediately above.

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