Question

Which of the following units is useful in relating concentration of solution with its vapour pressure?

(a) Mole fraction
(b) Parts per million
(c) Mass percentage
(d) Molality

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Answer


(a) According to Henry's law, the partial pressure of a gas in a solution is proportional to the mole fraction of the gas in the solution. This relationship is expressed as:

$$ \mathrm{p} = \mathrm{k}_{\mathrm{H}} \mathrm{x} $$

where ( \mathrm{K}_{\mathrm{H}} ) is Henry's constant.

Hence, the correct choice is (a) mole fraction.


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