When 4.20 g of solid NH4NO3 dissolves in 50.0 g of water at 26.8°C in a calorimeter, the temperature decreases to 20.9°C. The value of q for this reaction is 1.34 kJ. Calculate the enthalpy of solution (ΔH for the dissolution) in kilojoules per mole of NH4NO3 under the given conditions. (Assume that the specific heat of the aqueous solution is the same as water, 4.180 J/g·°C, and not sensitive to temperature over the temperature range.)

Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter5: Thermochemistry
Section: Chapter Questions
Problem 5.61QE: When 7.11 g NH4NO3 is added to 100 mL water, the temperature of the calorimeter contents decreases...
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When 4.20 g of solid NH4NO3 dissolves in 50.0 g of water at 26.8°C in a calorimeter, the temperature decreases to 20.9°C. The value of q for this reaction is 1.34 kJ. Calculate the enthalpy of solution (ΔH for the dissolution) in kilojoules per mole of NH4NO3 under the given conditions. (Assume that the specific heat of the aqueous solution is the same as water, 4.180 J/g·°C, and not sensitive to temperature over the temperature range.)

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