Chemistry - June 2006

Please help by providing an equation and reasoning.

In a coffee-cup calorimeter, 1.40 g of NH4NO3 was mixed with 74.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents was 23.71°C.

(a) Assuming the solution has a heat capacity of 4.18 J/g°C, and assuming no heat loss to the calorimeter, calculate the enthalpy of solution (Delta Hsoln) for the dissolution of NH4NO3 in units of kJ/mol.

b)(b) If the enthalpy of hydration for NH4NO3 is -630. kJ/mol, calculate the lattice energy of NH4NO3.

Thanks.

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