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when a 20.8g sample of CsBr was comcined with 115.0g water in a coffee cup calorimeter,...

when a 20.8g sample of CsBr was comcined with 115.0g water in a coffee cup calorimeter, the water temp decreased by 4.47 *C. based on this, how much heat energy was released when CsBr was dissolved? calculate the heat solution for CsBr in kj/mole. assume the specific heat is 4.184 J/g*C

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Answer #1

heat released(q) = m*s*DT

m = mass of solution = 115+20.8 = 135.8 g

s = specific heat of solution = 4.184 j/g.c

DT = 4.47 c

q = 135.8*4.184*4.47

= 2.54 kj

no of mol of CsBr dissolved = 20.8/ 212.81

                            = 0.098 mol
DHdiss = -q/n

       = -2.54/0.098

       = -25.92 kj/mol

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