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28 February, 16:29

A mixture of so2 (g) and o2 (g), formed by the complete decomposition of so3 (g), is collected over water at 34°c at a total pressure of 760 mmhg. if the vapor pressure of water is 40 mmhg at 34°c, what is the partial pressure of so2?

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  1. 28 February, 18:23
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    The decomposition of so3 to so2 gas and o2 gas can be described in the balanced chemical equation:

    2so3 (g) = 2 so2 (g) + 02 (g).

    so assuming a complete reaction, the ratio of so2 gas to total products is 2/3 while that of 02 is 1/3.

    Subtracting water's water vapor pressure, 760-40 mm hG = 720 mm Hg.

    then the products partial pressures are

    so2 = 2/3 * (720) = 480 mm Hg.

    o2 = 720-480 = 240 mm Hg.
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