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17 February, 08:39

a gas sample at 45 C has a pressure of 123 kPa. if the gas is cooled to 30 C, what is the new pressure?

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  1. 17 February, 10:57
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    = 127.06 kPa

    Explanation:

    According to pressure law which states that the pressure of a fixed mass of a gas is directly proportional to its absolute temperature at constant volume.

    Therefore;

    P1/T1 = P2/T2

    P1 = 123 kPa

    T1 = 30°C + 273°C = 303 K

    T2 = 40°C + 273°C = 313 K

    Therefore;

    P2 = P1T2/T1

    = (123 * 313) / 303

    = 127.06 kPa
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