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

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

A

43.4 J/mole

B

87.2 J/mole

C

900 J/mole

D

Zero

Answer

43.4 J/mole

Explanation

Solution

Boiling point (Tb)(T_{b}) = 1000C=373K\mathbf{= 373K}; ΔHv=900J/g\mathbf{\Delta}\mathbf{H}_{\mathbf{v}}\mathbf{= 900J/g}

ΔSvap=ΔHvT\mathbf{\Delta}\mathbf{S}_{\mathbf{vap}}\mathbf{=}\frac{\mathbf{\Delta}\mathbf{H}_{\mathbf{v}}}{\mathbf{T}}; Molecular weight of water = 18

ΔSvap=900×18373=43.4JK−1mol−1\Delta S_{vap} = \frac{900 \times 18}{373} = 43.4JK^{- 1}mol^{- 1}