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18 August, 11:36

A sample of oxygen gas has a volume of 36.7 L at 145 kPa and 65. ̊C. What volume will the sample have at STP?

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  1. 18 August, 14:38
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    Data Given:

    Initial Volume = V₁ = 36.7 L

    Initial Pressure = P₁ = 145 kPa

    Initial Temperature = T₁ = 65 °C + 273 = 338 K

    Final Volume = V₂ = ?

    Final Pressure = P₂ = 101.325 kPa (Standard Pressure)

    Final Temperature = T₂ = 273 K (Standard Temperature)

    Formula used:

    As number of moles are constant, so Ideal Gas equation in following form is used,

    P₁ V₁ / T₁ = P₂ V₂ / T₂

    Solving for V₂,

    V₂ = P₁ V₁ T₂ / T₁ P₂

    Putting Values,

    V₂ = (145 kPa * 36.7 L * 338 K) : (273 K * 101.325 kPa)

    V₂ = 1798667 : 27661.25

    V₂ = 65.02 L
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