Question

In a coffee-cup calorimeter, 11.0-g sample of solid CaCℓ2 is dissolved in 125 g of water at 25.0 oC. The temperature in the calorimeter is measured to be 39.2 oC when the dissolution of CaCℓ2 is completed. Assuming that the specific heat of solution is equal to that of water, i.e., 4.184 J/g oC, calculate the heat of solution of CaCℓ2 in water, in kJ/mol.

Answer 1

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Given moles of Callz = 11gm -- 0.049 moc . ingr/mole hear absorbed by H₂0 €q) = mSAT = 125 gmix 4.184 J x 39.2-25) - grc = 7426.6 J = 7.4266 kJ beat change per mole of Caug = -7.4266 0.099 = - 75.02 kJ/mole -ve sign indicates the reaction is exotheomic in nature