Calorimetry of a Salt Solution lab Calculate the percent differences salt experi

Question

Calorimetry of a Salt Solution lab

Calculate the percent differences salt experimental value and the accepted value for its enthalpy of solution.

Data from experimental:

Sample

Mass of water

Initial temp of water

Final temp of water

Change in temp of water

Energy change use mc t

Mass of salt used (g)

Enthal-

Phy of solution kj/g

NaOH

75 g

21.4 C

40.4 C

19

5962.2

6.28 g

0.94 kj/g

Sample

Mass of water

Initial temp of water

Final temp of water

Change in temp of water

Energy change use mc t

Mass of salt used (g)

Enthal-

Phy of solution kj/g

NaOH

75 g

21.4 C

40.4 C

19

5962.2

6.28 g

0.94 kj/g

Explanation / Answer

Enthalpy using salt solution = 6.28*0.94= 5903.2 J

Enthalpy by water solution = 5962.2

% change = (5962.2-5903.2)/5962.2 *100 = 0.989%

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