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16 February, 12:50

A 0.0200 gram piece of unknown alkaline earth metal, M, is reacted with excess 0.500 M H 2 SO 4, and the hydrogen gas produced is collected over water. The total gas pressure inside the collecting tube is 1.01 atm., the temperature 24.0 o C. The volume of gas collected is 19.6 mL. The gas in the tube contains water vapor, at a pressure of 0.029 atm. M (s) + H 2 SO 4 (aq) → MSO 4 (aq) + H 2 (g). What is the partial pressure of the dry hydrogen gas collected in the tube?

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  1. 16 February, 16:21
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    0.981atm

    Explanation:

    According ot Dalton's law total pressure of a mixture of non-reactive gas is equal to sum of partial pressures of individual gases.

    total pressure = 1.01at

    Number of gases=2

    Gases: water vapor and hydrogen

    partial pressure of water vapor = 0.029atm

    1.01 = partial pressure of water vapor + partial pressure of hydrogen

    1.01 = 0.029 + partial pressure of hydrogen

    partial pressure of hydrogen = 0.981atm
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