QJEEM24Chd3d2: JEE Main 2024 Chemistry - Class 11 JEEM24Chd3d2 Solution: The heat of solution of anhydrous CuSO 4 and CuSO 4 ⋅ 5 H 2 O…

Question

Verified Solution • 2025–26 Session moderate

The heat of solution of anhydrous ${CuSO}_{4}$ and ${CuSO}_{4} \cdot 5 H_{2} O$ are $- 70 kJ {mol}^{- 1}$ and $+ 12 kJ {mol}^{- 1}$ respectively.

The heat of hydration of ${CuSO}_{4}$ to ${CuSO}_{4} \cdot 5 H_{2} O$ is $- x kJ$ . The value of $x$ is ________. (nearest integer).

Accepted Answer

(I) ${CuSO}_{4} + H_{2} O ⟶ {CuSO}_{4}$ Solution $Δ H = - 70 kJ$

(II) ${CuSO}_{4} \cdot 5 H_{2} O + H_{2} O ⟶ {CuSO}_{4}$ Solution $Δ H = 12 kJ$

(I) - (II)

$\begin{aligned} {CuSO}_{4} + H_{2} O ⟶ {CuSO}_{4} \cdot 5 H_{2} O \\ Δ H = - 70 - 12 = - 82 \end{aligned}$

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