NAME RESULTS Experiment 2: Heat of Solution of an lonic Salt Name and formula of

Question

NAME RESULTS Experiment 2: Heat of Solution of an lonic Salt Name and formula of the salt fete n itrate. NO Molar mass of salt (g/mo/) 01d-tea Trial I Trial 2 10 1) 2) 3) 4) 5) 6) 7) Mass of salt (g) Moles of salt (mol) Mass of calorimeter (g) Mass of calorimeter +water (g) Mass of water (g) Initial temperature(°C) Final temperature(C) i6 91 16.7og 113.4350 94.742 2.0"c Temperature Recording Record temperature at 15-sec intervals for the first minute and 30-sec intervals for 4 minutes thereafter in your lab notebook Trial 1 Trial 2 15 sec 30 sec 45 sec -le'L 60 sec 90 sec 120 sec 150 sccc - 115 lyte -14°C. 180) see

Explanation / Answer

Heat of solution

Calculations,

Trial 1,

1. change in temperature (dT) = 21 - 14 = -7 oC

2. heat change for H2O = mCpdT = 96.675 x 4.18 x -7 = -2828.71 J

3. heat change for salt = 10.08 x 0.94 x -7 = -66.33 J

4. Total heat change = -2895.04 J

5. Enthalpy change per mole salt = -(-2895.04 J x 101.102 g/mol/10.08 g x 1000) = 29.04 kJ/mol

Trial 2,

1. change in temperature (dT) = 20 - 14 = -6 oC

2. heat change for H2O = mCpdT = 94.742 x 4.18 x -6 = -2376.13 J

3. heat change for salt = 10.02 x 0.94 x -6 = -56.513 J

4. Total heat change = -2432.64 J

5. Enthalpy change per mole salt = -(-2432.64 J x 101.102 g/mol/10.05 g x 1000) = 24.47 kJ/mol

6. Average enthalpy change = 26.75 kJ/mol

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