When 0.2 mole of anhydrous CuSO 4 is dissolved in water, the heat evolved is 1.451 kcal.If 0.2 mole of CuSO 4 ⋅ 5 H 2 O is dissolved in water, the heat absorbed is 0.264 kcal. Calculate the molar heat of hydration of CuSO 4.

Question

When 0.2 mole of anhydrous CuSO 4 is dissolved in water, the heat evolved is 1.451 kcal.If 0.2 mole of CuSO 4 ⋅ 5 H 2 O is dissolved in water, the heat absorbed is 0.264 kcal. Calculate the molar heat of hydration of CuSO 4. (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

text (i) CuSO 4( s )+ H 2 O longrightarrow CuSO 4 text (aq) Δ H =(-1.451/0.2)=-7.255 k cal mol -1 (ii) CuSO 4 ⋅ 5 H 2 O (s) longrightarrow CuSO 4 (aq) +5 H 2 O Δ H =(0.264/0.2)=1.32 k cal mol -1 From (i)-(ii), CuSO 4( s )+5 H 2 O ( l ) longrightarrow CuSO 4 ⋅ 5 H 2 O ( s ); Δ H =-8.575 k cal mol -1

Q. When 0.2 mole of anhydrous CuSO4​ is dissolved in water, the heat evolved is 1.451kcal.If 0.2 mole of CuSO4​⋅5H2​O is dissolved in water, the heat absorbed is 0.264kcal. Calculate the molar heat of hydration of CuSO4​.

(i) CuSO4​(s)+H2​O⟶CuSO4​ (aq) ΔH=0.2−1.451​=−7.255kcalmol−1 (ii) CuSO4​⋅5H2​O(s)⟶CuSO4​(aq)+5H2​O ΔH=0.20.264​=1.32kcalmol−1 From (i)-(ii), CuSO4​(s)+5H2​O(l)⟶CuSO4​⋅5H2​O(s); ΔH=−8.575kcalmol−1

Q. When $0.2$ mole of anhydrous $C u S O_{4}$ is dissolved in water, the heat evolved is $1.451 k c a l$ .If $0.2$ mole of $C u S O_{4} \cdot 5 H_{2} O$ is dissolved in water, the heat absorbed is $0.264 k c a l$ . Calculate the molar heat of hydration of $C u S O_{4}$ .