Answer : The amount of heat released is, -121.04 KJ
Solution : Given,
Enthalpy of reaction,
= -890 KJ
Mass of methane = 6 g
Molar mass of methane = 44 g/mole
First we have to calculate the moles of methane.

The given balanced reaction is,
From the balanced reaction we conclude that
1 mole of methane releases heat = -890 KJ
0.136 moles of methane releases heat =
Therefore, the amount of heat released is, -121.04 KJ