You know you get 802.3 kJ for burning 16 g CH4 and you know that from the question. All you need to do is to convert that to (it's just a proportion) to 237 and not 16 g CH4.
heat produced is 802.3 kJ x (237/16) = ?
CH4 (g) + 2 O2 (g) --> CO2 (g) + 2 H2O (g), (triangle)H rxn =-802.3 kj
How much heat is produced by the complete combustion of 237 g of CH4?
2 answers
11884.06875