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Q.

Calculate the concentration of nitrogen present in the water. Assuming that the temperature is 25oC, total pressure is 1 atm and mole fraction of nitrogen is
 0.78. KH for nitrogen =8.42×10−7M/mmHg

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a

4.99 M

b

4.99×10−2M

c

None of the above

d

4.99×10−4M

answer is C.

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Detailed Solution

pN2=xN2×ptotal                       [∵1atm=760mmHg]
pN2=0.78×1atm=0.78×760mm=592.8mm
Concentration in solution
=KH×pN2=8.42×10−7M(mm)−1×592.8mm=4.99×10−4M

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