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19 February, 13:28

A gas at STP has a volume of 1.0 liter. If the pressure is doubled and the temperature remains constant, the new volume of the gas will be ... ?

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  1. 19 February, 14:02
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    PV = nRT

    A gas at STP ... This means that the temperature is 0°C and pressure is 1 atm.

    R is the gas constant which is 0.08206 L*atm / (K*mol)

    Rearranging for volume

    V = nRT/P

    The temperature and number of moles are held constant. This means that this uses Boyle's Law. (The ideal gas law could be manipulated to give us this result when T and n are held constant.)

    PV = k

    where k is a constant.

    This means that

    P₁V₁ = k = P₂V₂

    P₁V₁ = P₂V₂

    (1 atm) * (1 L) = (2 atm) * V₂

    V₂ = 0.5 L

    The new volume of the gas is 0.5 L.
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