A coffee-cup calorimeter containing 100 mL of H 2 O is used. The initial tempera

Question

A coffee-cup calorimeter containing 100 mL of H2O is used. The initial temperature of the calorimeter is 23.0 oC. If 2.60g of CaCl2 is added to the calorimeter, what will be the final temperature of the solution in the calorimeter?

A coffee-cup calorimeter containing 100 mL of H2O is used. The initial temperature of the calorimeter is 23.0 degree C. If 2.60g of CaCl2 is added to the calorimeter, what will be the final temperature of the solution in the calorimeter? The heat of solution Delta H soln of CaCl2 is -82.8 kJ/mol.

Explanation / Answer

Heat released by CaCl2=No of moles x dH

=(2.60/111)(82.8)

=1.939 KJ

=1939.46 J

Let the final temperature of solution be T

So 1939.46=(100+2.60)(4.184)(T-23)

T=27.51 deg C

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