Data Table –– Heat of DissolutionSaltNH4ClCaCl2NaClNaOHVolume of water45.0 mL45.0 mL45.0 mL45.0 mLDensity of H2O0.9989 g/mL0.9989 g/mL0.9989 g/mL0.9989 g/mLMass of H2O Mass of salt5.005 g5.037 g5.024 g5.078 gMolar mass of salt53.49 g/mol110.98 g/mol58.44 g/mol40.00 g/molMoles of salt0.009357 mol0.04539 mol0.08597 mol0.1269 molMass of solution (m)50.0 g50.1 g50.1 g50.1 gInitial temperature (Tinitial)23.9°C22.2°C23.7°C22.8°CFinal temperature (Tfinal)16.5°C36.5°C21.5°C40.5°CTemperature change (Tfinal−Tinitial) Heat of dissolution(Q) Heat of dissolution per mole (Qsoln) Fill out the missing rows of your data table.(for numbers 1-3, you can pick one column of solid and just show the calculation for that column)Determine the change in temperature of the system after dissolution of the various salts in water. 2. Determine the heat of dissolution/energy change (Q, in joules) for each one of the solutions prepared. (Q of water is 4.18 J/goC)3. Calculate the heat of dissolution per mole of solute (Qsoln, in kJ/mol) for each one of the ionic solids used. 4. Based on these results, describe the energy changes that take place when each one of the salts dissolves in water. Which ionic solid has an exothermic heat of dissolution in water (releases heat to surroundings)? Which ionic solid has an endothermic heat of dissolution in water (absorbs heat from the surroundings)? Which solid will make the best cold pack and why?

1.) Temperature can be can be calculated using the final temperature and initial temperature. 2.)…

Answered: etermine the change in temperature of…

Introductory Chemistry For Today

8th Edition

ISBN:9781285644561

Author:Seager

Publisher:Seager

Chapter7: Solutions And Colloids

Section: Chapter Questions

Problem 7.89E

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Data Table –– Heat of Dissolution
Salt	NH₄Cl	CaCl₂	NaCl	NaOH
Volume of water	45.0 mL	45.0 mL	45.0 mL	45.0 mL
Density of H₂O	0.9989 g/mL	0.9989 g/mL	0.9989 g/mL	0.9989 g/mL
Mass of H₂O
Mass of salt	5.005 g	5.037 g	5.024 g	5.078 g
Molar mass of salt	53.49 g/mol	110.98 g/mol	58.44 g/mol	40.00 g/mol
Moles of salt	0.009357 mol	0.04539 mol	0.08597 mol	0.1269 mol
Mass of solution (m)	50.0 g	50.1 g	50.1 g	50.1 g
Initial temperature (T_initial)	23.9°C	22.2°C	23.7°C	22.8°C
Final temperature (T_final)	16.5°C	36.5°C	21.5°C	40.5°C
Temperature change (T_final−T_initial)
Heat of dissolution (Q)
Heat of dissolution per mole (Q_soln)

Fill out the missing rows of your data table.

(for numbers 1-3, you can pick one column of solid and just show the calculation for that column)

Determine the change in temperature of the system after dissolution of the various salts in water.

2. Determine the heat of dissolution/energy change (Q, in joules) for each one of the solutions prepared. (Q of water is 4.18 J/g^oC)

3. Calculate the heat of dissolution per mole of solute (Q_soln, in kJ/mol) for each one of the ionic solids used.

4. Based on these results, describe the energy changes that take place when each one of the salts dissolves in water. Which ionic solid has an exothermic heat of dissolution in water (releases heat to surroundings)? Which ionic solid has an endothermic heat of dissolution in water (absorbs heat from the surroundings)? Which solid will make the best cold pack and why?

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