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Q.

The normal boiling point of water is 373 K (at 760 mm). Vapour pressure of water at 298 K is 23 mm. If enthalpy of vapourisation is 40.656 KJ/mol, the boiling  point of water at 23 mm atmospheric pressure will be

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a

294 K

b

51.6 K

c

12.5 K

d

250 K

answer is C.

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Detailed Solution

ln76023=406568.3141T1-1373

T1 = boiling point = 294 K

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