Compound (kilocalories/mole)

H₂O(l) -68.3

CO₂(g) -94.1

O₂(g)

C₃H₈ ????

When 1.000 gram of propane gas, C₃H₈, is burned at 25^oC and 1.00 atmosphere, H₂O(l) and CO₂(g) are formed with the evolution of 12.03 kilocalories.

a) If 2.55 grams of propane fuel is burned to heat 535.7 grams of water from room temperature, what will be its final temperature?

b) Why is there no Delta H_f value for O₂ listed.