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CRS Question, 6–13
QUESTION
(continued)
The
instant cold packs associated with athletic injuries makes use
of the heat change when NH4NO3 dissolves.
If 8.0 grams of NH4NO3 (molar mass = 80.0) were
placed in 100.0 mL of water such as shown in the constant
pressure calorimeter, and the temperature change was
– 6.0°C, what would you calculate as the DH for dissolving one mole of NH4NO3?
1. –2 500 kJ/mol
2. +2 500 kJ/mol
3. –25 kJ/mol
4. +25 kJ/mol
