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26 May, 06:35

A particular sample of air is 2.5% water vapor express the concentration of water vapor in parts per million

A. 0.0000025 ppm

B. 250 ppm

C. 25000 ppm

D. 0.025 ppm

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Answers (1)
  1. 26 May, 10:13
    0
    25000 ppm

    Explanation:

    Parts Per Million is defined as the number of parts of a solute per one million parts of a solution.

    ppm = (Weight of Solute / Weight of Solution) * 10⁶ - - - (1)

    Let us suppose that the air (solution) weights 100 grams, then 2.5 % of water vapors will have following mass,

    Mass of Vapors g / 100 g * 100 = 2.5

    Or,

    Mass of Vapors = 2.5 * 100 / 100

    Mass of Vapors = 2.5 g

    Hence, mass of water vapors is 2.5 g.

    Now, putting mass of water vapors and air in eq. 1,

    ppm = (2.5 / 100) * 10⁶

    ppm = 25000
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