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7 October, 10:03

A reaction at 17.0 degree C evolves 788. mmol of dinitrogen difluoride gas. Calculate the volume of dinitrogen difluoride gas that is collected. You can assume the pressure in the room is exactly 1atm. Be sure your answer has the correct number of significant digits.

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  1. 7 October, 12:25
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    V = 18.8 L

    Explanation:

    This question is solved by using the ideal gas law:

    PV = nRT ∴ V = nRT/P

    where n = 0.788 mmol = 0.788 mol (1 mmol is a thousandths of a mol)

    R = R constant for ideal gases = 0.08206 Latm/Kmol

    T = 17.0 ºC = (17.0 + 273) K = 290 K

    and V = volume in liters our unknown

    Plugging our values and solving for V,

    V = 0.788 mol x 0.08206 Latm/Kmol x 290 K / 1atm = 18.8 L
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