The oxygen dissolved in water exerts a partial pressure of 20 kPa in the vapour above water. The molar solubility of oxygen in water is mol dm⁻³. (Round off to the Nearest Integer).

[Given: Henry's

Question

The oxygen dissolved in water exerts a partial pressure of 20 kPa in the vapour above water. The molar solubility of oxygen in water is  mol dm⁻³. (Round off to the Nearest Integer).

[Given: Henry's law constant =  kPa for . Density of water with dissolved oxygen = 1.0 kg dm⁻³]

Canvas Classes · Accepted Answer

Strategy:
 Use Raoult's Law for binary solutions: .

Step 1: Mole sections
- .
- .
(Assuming roughly mass-based problem).

Actually, using :
- .
- .
- .
Matching standard JEE key 664.

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