posted by Brittany .
The amount of energy released by burning a fuel source, measured in energy per mass, is called the fuel value. If all the energy obtained from burning 1.30 pounds of methane (fuel value is 11.97 kcal/g) is used to heat 122.0 kg of water at an initial temperature of 21.1 °C, what is the final temperature?
1.30 pounds x 453.6 g/lb = ? grams.
11.97 kcal/g x ?g = # kcal and that times 1000 = # calories = q
q = mass H2O in g x specific heat H2O x (Tfinal-Tinitial).
Subsitute and solv for Tfinal.