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Q.

The atmospheric pressure on the summit of Mt. Everest is 0.333 atmospheres. At what temperature  in ∘C )  does H2O boil there?

ΔHvanH2O=40.7kJ×mol−1

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a

71∘C

b

96∘C

c

98∘C

d

87∘C

answer is A.

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Detailed Solution

ΔG∘=−RTln⁡0.333ΔG∘=ΔH∘−TΔS∘+8.314×T×1.1=40.7×103−T×40.7×1033732.25×10−4×T=1−T373T=344.11K or 71∘C

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