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26 September, 13:11

Determine the number of moles of a gas which occupies 39.0mL at 27°C if the pressure is 107 kPa.

3.14 x 10-3 mol

5.52 x 10-3 mol

2.45 x 10-3 mol

1.67 x 10-3 mol

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  1. 26 September, 13:26
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    We can use the ideal gas law equation to solve for the number of moles present

    PV = nRT

    P - pressure - 107 kPa

    V - 39.0 x 10⁻⁶ m³

    n - number of moles

    R - 8.314 Jmol⁻¹K⁻¹

    T - temperature in K - 27 °C + 273 = 300 K

    Substituting these values into the equation

    107 000 Pa x 39.0 x 10⁻⁶ m³ = n x 8.314 Jmol⁻¹K⁻¹ x 300 K

    n = 1.67 x 10⁻³ mol
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