30.4 kJ of heat is required to melt one mole of sodium chloride and the entropy change at the melting point is 28.4 J at 1 atm. The melting point of sodium chloride is ________ K. (Nearest integer) [2023]

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Solution

Q.
30.4 kJ of heat is required to melt one mole of sodium chloride and the entropy change at the melting point is 28.4 J $K^{- 1}$ ${mol}^{- 1}$ at 1 atm. The melting point of sodium chloride is ________ K. (Nearest integer) [2023]

Ans.
(1070)

$Δ S = \frac{Δ H_{fus}}{T_{m p}}$

$28.4 = \frac{30.4 \times 1000}{T_{m p}}$

$T_{m p} = 1070.422 K$

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