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25 October, 01:52

If 15.0 g of a solid dry ice (Co2) is placed into an evacuated 5.00 L container and allowed sublime until it is entirely in the gas phase, what pressure (in atm) will the gas exert at 299 K?

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  1. 25 October, 02:05
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    dа ta:

    mass, m = 15.0 grams

    Molecule = CO2

    volume, V = 5.00 liter

    temperature, T = 298 K

    pressure, P = ?

    Formulas:

    PV = nRT

    n = m / molar mass

    Solution:

    molar mass of CO2 = 44.01 g/mol

    n = 15.0 g / 44.01 g/mol = 0.3408 mol

    P = nRT / V = 0.3408 mol * 0.0821 atm*liter/K*mol * 299K / 5.00 liter

    P = 1.67 Pa

    Answer: P = 1.67 Pa
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