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11 October, 06:13

If a mixture of gases contained 78% nitrogen at a pressure of and 22% carbon dioxide at, what is the total pressure of the system? 1,329 atm 17.5 cm hg 639 torr 1.75 atm none of these

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  1. 11 October, 06:36
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    The pressures given are the partical pressures of the two gases.

    The law of Dalton or of the partial pressures states that the total pressure of a mixture of gases is equal to the sum of the pressures of all the gases.

    So, in this case:

    Total pressure = pressure of nitrogen + pressure of carbon dioxyde.

    Of course both terms must be in the same units.

    i have found that the pressures for this problem are:

    Pressure of nitrogen = 984 torr

    Pressure of carbon dioxyde = 345 torr

    Total pressure = 984 torr + 345 torr = 1329 torr.

    Now convert to atm: 1 atm = 760 torr

    => 1329 torr * 1 atm / 760 torr = 1.74868 atm ≈ 1.75 atm

    Answer: 1.75 atm
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