A2.56g sample of anthracene c14h10, was burned to heat an aluminum calorimeter (mass= 948 g). the calorimeter contained 1.50 l of water with an initial temperature of 20.5oc and a final temperature of 34.3oc.

Given:

mass sample: 2.56g C14H10
mass of calorimeter: 948g
mass of water: 1.50g (assuming 1g/L density)

Ti = 20.5 C
Tf = 34.3 C

Solving for the total heat:

delta H(water) = 1.50 * 4.184 * (34.3 - 20.5)
                       = 86.61 J