When 2.38 g of methane burns in oxygen, 119 kJ of heat is produced. What is the enthalpy of combustion (in kJ) per mole of methane under these conditions? Your answer will be in kJ/mol.

Question

the Molar Mass of methane is 16.04, so I did 2.38g/16.04=0.14838 mol

Then I did 119 kj/0.14838 mol= 802 kJ/mol.

My HW system isn't accepting this. What did I do wrong?

Answer 1

I think you forgot the negative sign as in -802 kJ/mol.

Answer 2

Ah, Okay. Thanks!