Chem Help?

Question

When 0.404 g of compound X is burned com-
pletely in a bomb calorimeter containing 3000
g of water, a temperature rise of 0.428 C is
observed. What is delta(U) for the combustion
of compound X? The hardware component of
the calorimeter has a heat capacity of 3.54
kJ/C. The specific heat of water is 4.184
J/g*C, and the MW of X is 56.0 g/mol. An-
swer in units of kJ=mol.

Answer 1

0.404 g of compound X (its MW is 56.0 g/mol) is 0.00721 mol of compound X.
The heat generated is:
(3*4.184+3.54)*0.428 = 6.887 (kJ)
∆U = 6.887kJ / 0.00721 mol = 955 kJ/mol