Q.

The Henry’s law constant for solubility of N2 gas in water at 298k is 1.0 × 105 atm. The mole fraction of N2 in air is 0.8. The number of moles of N2 from air dissolved in 10 moles of water at 298k and 5 atm pressure is:

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a

4 × 10–4

b

4.0 × 10–6

c

4.0 × 10–5

d

5.0 × 10–4

answer is A.

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Detailed Solution

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5×0.81×105=nN210;nN2=4×10×105=4×104

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