Thermochemsitry Question Please help!!?

How do you find the enthalpy of combustion of calclium using Hess s Law
when you have the calorimeter constant value = 96.542J/℃
Update: Using my calorimeter this is my data ... Equilibrium temperatures reached Trial #1 Starting Temperature of Cold water (℃) 21 Starting Temperature of Hot Water (℃) 83 Equilibrium Temperature Reached (℃) 47 Trial #2 Starting Temperature of Cold water (℃) 21 Starting Temperature of Hot Water (℃) 83... show more Using my calorimeter this is my data ...

Equilibrium temperatures reached
Trial #1
Starting Temperature of Cold water (℃) 21
Starting Temperature of Hot Water (℃) 83
Equilibrium Temperature Reached (℃) 47

Trial #2
Starting Temperature of Cold water (℃) 21
Starting Temperature of Hot Water (℃) 83
Equilibrium Temperature Reached (℃) 48


Trial #3
Starting Temperature of Cold water (℃)20
Starting Temperature of Hot Water (℃) 77
Equilibrium Temperature Reached (℃) 46
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