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If O2 gas is bubbled through water at 303 K, the number of millimoles of O2 gas that dissolve in 1 litre of water is ________. (Nearest Integer) (Given : Henry's Law constant for O2 at 303 K is 46.82 k bar and partial pressure of O2 = 0.920 bar) (Assume solubility of O2 in water is too small, nearly negligible)

1. 1
2. 2
3. 3
4. 4

Correct answer: 1

Solution

According to Henry's Law, the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid. Given the Henry's Law constant for O2 at 303 K and the provided partial pressure, the calculation shows that only about 1 millimole of O2 can dissolve in 1 litre of water.

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