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6 January, 18:19

What is the mass of neon that exerts a pressure of 720. mmHg, with a temperature of - 15.0 °C, when the volume of the container is 760. mL?

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  1. 6 January, 20:59
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    Mass = 0.61 g

    Explanation:

    Given dа ta:

    Pressure of neon gas = 720 mmHg

    Temperature = - 15.0°C

    Volume = 760 mL

    Mass of neon gas = ?

    Solution:

    720 mmHg = 720/760 = 0.95 atm

    -15.0°C + 273 = 258 K

    760/1000 = 0.76 L

    PV = nRT

    n = PV/RT

    n = 0.95 atm * 0.76 L / 0.0821 atm. L. k⁻¹. mol⁻¹ * 258 K

    n = 0.722 atm. L / 21.2 atm. L. mol⁻¹

    n = 0.03 mol

    Mass of neon:

    Mass = number of moles * molar mass

    Mass = 0.03 mol * 20.2 g/mol

    Mass = 0.61 g
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