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16 September, 11:31

75 mL of a gas is at 690 mmHg at - 45°C. What will be the new volume at

STP? -

+1
Answers (1)
  1. 16 September, 11:50
    0
    The answer to your question is Volume 2 = 87.5 ml

    Explanation:

    Data

    Volume 1 = V1 = 75 ml

    Pressure 1 = P1 = 690 mmHg

    Temperature 1 = T1 = - 45°C

    Volume 2 = V2 = ?

    Pressure 2 = 760 mmHg

    Temperature 2 = 20°C

    Process

    1. - Convert the temperature to °K

    T1 = - 45 + 273 = 228°K

    T2 = 20 + 273 = 293°K

    2. - Use the combined gas law to solve this problem

    P1V1/T1 = P2V2/T2

    -Solve for V2

    V2 = (P1V1T2) / T1P2

    -Substitution

    V2 = (75 x 690 x 293) / (228 x 760)

    -Simplification

    V2 = 15162750 / 173280

    -Result

    V2 = 87.5 ml
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