What is the heat associated with the combustion of 0.800g butane, C4H10

the combustion reaction is 2C4H10(g) + 10H2O(g)
a.-36.6kJ
b.-7.01kJ
c.-2.13x103kJ
d.-1.730kJ
e.-73.2kJ

The standard heat of combustion for butane is -2877.5 kJ/mol. The molar mass of butane is 58.1-g/mol.

0.800-g C4H10 x (1 mol C4H10 / 58.1-g C4H10) x (-2877.5-kJ/mol) = -39.6-kJ.

Although this is not one of your choices, the closest is ANS 'a': -36.6 kJ