If 900 J/g of heat is exchanged at boiling point of water, then what is increase

If 900 Jg Of Heat Is Exchanged At Boiling Point Chemistry QuestionIf 900 Jg Of Heat Is Exchanged At Boiling Point Chemistry Question

If 900 J/g of heat is exchanged at boiling point of water, then what is increase in entropy

Options

(a) 900 J/mol
(b) 87.2 J/mol
(c) 43.4 J/mol
(d) Zero

Correct Answer:

43.4 J/mol

Explanation:

Heat exchanged at boiling point of water
= 900 J/g = 900 x 18 J/mol = 16200.0 J/mol.
ΔS(vap) = ΔH(vap) / T(b) = 16200/ 373 ( therefore T(b) = 273 + 100 = 373 K)
= 43.4 J/mol.

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