A solution was prepared by dissolving 7.45 g of KCl in 200 g of in a calorimeter with a water equivalent of 25 g. The temperature of the water had reduced from to . (in kJ/mol) for dissolving KCl in w

Question

A solution was prepared by dissolving 7.45 g of KCl in 200 g of $	ext{H}_2	ext{O}$ in a calorimeter with a water equivalent of 25 g. The temperature of the water had reduced from $28^\circ	ext{C}$ to $25^\circ	ext{C}$. $\Delta H$ (in kJ/mol) for dissolving KCl in water is (Specific heat capacity of water is 4.2 J/K-g.)

Prashant Kotian · Accepted Answer

Correct answer: D. Molar mass of KCl is 74.5 g/mol, so 7.45 g = 0.1 mol. Total mass heated equivalent = . Heat absorbed from the system . The enthalpy change per mole .

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