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10 February, 16:46

Which gas below has the largest number of moles at STP?

a.) 22.4L Ne

b.) 20L Ar

c.) 2.24L Xe

d.) They all have the same number of moles.

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Answers (1)
  1. 10 February, 17:12
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    a.) 22.4 L Ne.

    Explanation:

    It is known that every 1.0 mol of any gas occupies 22.4 L.

    For the options:

    22.4 L Ne:

    It represents 1.0 mol of Ne.

    20 L Ar:

    using cross multiplication:

    1.0 mol occupies → 22.4 L.

    ? mol occupies → 20 L.

    The no. of moles of (20 L) Ar = (1.0 mol) (20 L) / (22.4 L) = 0.8929 mol.

    2.24 L Xe:

    using cross multiplication:

    1.0 mol occupies → 22.4 L.

    ? mol occupies → 2.24 L.

    The no. of moles of (2.24 L) Xe = (1.0 mol) (2.24 L) / (22.4 L) = 0.1 mol.

    So, the gas that has the largest number of moles at STP is: a.) 22.4 L Ne.
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