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20 March, 22:16

A 5.00 L sample of helium at STP expands to 20.0 L. What is the new pressure on the gas?

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  1. 21 March, 00:05
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    Answer is: the new pressure on the gas is 0.25 atm or 25.33 kPa.

    Boyle's Law: the pressure volume law - volume of a given amount of gas held varies inversely with the applied pressure when the temperature and mass are constant.

    p ₁V₁ = p₂V₂.

    1 atm · 5.00 L = p ₂ · 20.0 L.

    p ₂ = 1 atm · 5 L : 20.0 L.

    p₂ = 0.25 atm, but same amount of helium.
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