The copper(II) chloride and aluminum reaction. calculate the kilojoules of heat

Question

The copper(II) chloride and aluminum reaction. calculate the kilojoules of heat produced by the reaction, assuming that no energy left the calorimeter.

The specific heat of the solution is 3.96J/gC ( include the mass of the aluminum foil in the total mass of the solution.

Data: Trial 1 Trial2

mass of calorimeter: 8.473g 8.610g

mass of solid Cucl2*2H2O: 3.232g 3.236g

mass of copper solution: 64.594g 62.637g

mass of aluminum foil: 0.814g 0.807g

initial temperature: 19.6C 20.8C

final temperature: 49.2C 53.4C

Explanation / Answer

Trial 1

Qsolution = m*C*(Tf-Ti)

mass of solutino = 64.594+0.814 = 65.408

Qsoln = 65.408*3.96*(49.2-19.6) = 7666.86 J = 7.66 kJ

trial 2:

Qsolution = m*C*(Tf-Ti)

mass of solutino = 62.637+0.807= 63.444

Qsoln = 63.444*3.96*(53.4-20.8) = 8190.36 J = 8.19 kJ

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