Question

2.1 g of a hydrocarbon fuel is burned in a calorimeter that contains 280 grams of water initially at 25.00◦C. After the combustion, the temperature is 26.55◦C. How much heat is evolved per gram of fuel burned? The heat capacity of the calorimeter (hardware only) is 92.3 J/◦C.

1. 14014 J/g
2. 143 J/g
3. 932 J/g
4. 14879 J/g
5. 29431 J/g
6. 1958 J/g
7. 1815 J/g
8. 864 J/g

Answer 1

q = [mass H2O x specific heat H2O x (Ttinal-Tinitial)] + Ccal x (Tfinal-Tinitial) and that gives you q for 2.1. Change to q for 1 g.