The delta H _ vap is related to the strength of intermolecular forces. Which of

Question

The delta H _ vap is related to the strength of intermolecular forces. Which of the following has the lowest delta H _ vap? a. C _ 3H _ 8 b. C _ 6H _ 12 c. C _ 3H _ 7OH d. C _ 3H _ 7NH _ 2. e. C _8H _ 18 Calculate the amount of heat (in joules required to convert 92.5 g of water at 25.0^degreeC to steam at 108.0^degree C. (Sp. heat of H_2O(l) = 4.18 J/g^degree C, Sp. Heat of H_2O(g) = 2.03 J/g^degree C, heat of vap. Of H_2O(L) = 2.260 KJ/G) a. 2.26 times 10^5 J b. 3.05 times 10^4 J c. 2.40 times 10^5 J d. 2.20 times 10^4 J e. 6.43 times 10^5 J

Explanation / Answer

3)

weaker the intermolecular force, easier will be to vaporise a compound and hence lower will be its Hvap

Hvap is lowest for that compound which has weakest intermolecular force

C3H7OH and C3H7NH2 has hydrogen bonding which are strong as compared to C3H8,C6H12,C8H18 which have vander waal’s force of attraction

Between C3H8,C6H12 and C8H18 , C3H8 will have wekest vander waal force of attraction

So, Hvap will be lowest for C3H8

Answer: a

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