C. Enthalpy (Heat) of Solution for the Dissolution of a Salt
Name of salt
Trial 1 Trial 2
1. Mass of salt (g) 5.0704 g 5.1100 g
2. Moles of salt (mol)
3. Mass of calorimeter (g) 19.4958 g 18.6906 g
4. Mass of calorimeter + water (g) 38.3947 g 37.9524 g
5. Mass of water (g)
6. Initial temperature of water (°C) 24 °C 23 °C
7. Final temperature of mixture from graph (°C) 23 °C 22 °C
8. Instructor's approval of graph
Calculations for Enthalpy (Heat) of Solution for the Dissolution of a Salt
1. Temperature change of solution, ?T (°C)
2. Heat change of water (J)
3. Heat change of salt (J) (Obtain its specific heat from Table 25.1.)*
4. Total enthalpy change (J)
5. ?H, (J/mol salt), equation 25.12
6. Average ?H, (J/mol salt)
*Optional. See instructor.
**Show calculations for Trial 1. Report the result with the correct number of significant figures.
