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11 August, 21:23

g A mixture of gasses comprised of oxygen, nitrogen, and hydrogen has a total pressure of 760 mm Hg. The pressure due to hydrogen was found to be 70 mm Hg and the pressure due to oxygen was 650 mm Hg. What was the partial pressure of nitrogen

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  1. 11 August, 21:37
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    40 mmHg

    Explanation:

    Dalton's Law of Partial Pressures, states that the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of the individual gases in the mixture. Hence if I have gases A, B and C and I choose to designate the pressure of gas A as PA, the pressure of gas B as PB, the pressure of gas C as PC and the total pressure of all the gases together as PT. Then from Dalton's law; PT = PA + PB + PC

    From the question; we designate the pressure of hydrogen as PA, pressure of nitrogen as PB and pressure of oxygen as PC.

    PA = 70 mmHg

    PB = the unknown

    PC = 650 mmHg

    If the total pressure of the gas mixture (PT) = 760 mmHg

    Then;

    760 = 70 + PB + 650

    PB = 760 - (70+650)

    PB = 760 - 720

    PB = 40 mmHg

    Therefore, the partial pressure of nitrogen is 40 mmHg
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