When 0.800 g of NH4NO3 was added to 150.0 g of water in a styrofoam cup, the temperature dropped by 0.413°C. The heat capacity of H2O is 4.18 J/g°C. Assume the specific heat of the solution equals that of pure H2O and that the calorimeter neither absorbs nor leaks heat. What is the molar heat of solution of solid NH4NO3?
A) +260. J/mol
B) -2.60 kJ/mol
C) +2.60 kJ/mol
D) +26.0 kJ/mol
E) none of these
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