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2 December, 19:08

A gas occupies a volume of 140 ml at 35.0 c and 97 kpa. what is the volume of the gas at stp

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  1. 2 December, 19:23
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    We first need to find the number of moles of gas at the conditions given. we have to apply ideal gas law equation to find the number of moles

    PV = nRT

    where

    P - pressure - 97 kPa

    V - volume - 0.140 x 10⁻³ m³

    n - number of moles

    R - universal gas constant - 8.314 Jmol⁻¹K⁻¹

    T - temperature - 273 + 35 = 308 K

    substituting these values in the equation

    97 000 Pa x 0.140 x 10⁻³ m³ = n x 8.314 Jmol⁻¹K⁻¹ x 308 K

    n = 5.30 x 10⁻³ mol

    at standard pressure and temperature conditions,

    1 mol of gas occupies 22.4 L

    therefore 0.00530 mol - 22.4 L/mol x 0.00530 mol

    the volume occupied - 0.1187 L

    volume of gas at STP is 118.7 mL
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