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    SLPaper 2
    1.

    A quantity of 0.24 mol of an ideal gas of constant volume 0.20 m3m^3m3 is kept at a temperature of 300 K. Calculate the pressure of the gas.

    [1]
    Verified
    Solution

    p=«nRTV=0.24×8.31×3000.20=»3.0×103p=«\frac{nRT}{V}=\frac{0.24 \times 8.31 \times 300}{0.20}=» 3.0 \times 10^3p=«VnRT​=0.200.24×8.31×300​=»3.0×103 « Pa» 1 mark

    2.

    A container is filled with 1 mole of helium (molar mass 4 g mol−1^{-1}−1 and 1 mole of neon (molar mass 20 g mol−1^{-1}−1. Compare the average kinetic energy of helium atoms to that of neon atoms.

    [2]
    Verified
    Solution

    temperature is the same for both gases 1 mark

    «average» kinetic energy is the same «because Ek=32kTE_k=\frac{3}{2}kTEk​=23​kT OR EkE_kEk​ depends on TTT only» 1 mark

    Award 1 max for a bald statement that kinetic energy is the same.

    3.

    State what is meant by the internal energy of an ideal gas.

    [1]
    Verified
    Solution

    the total «random» kinetic energy of the molecules/atoms/particles 1 mark

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