Methane has the formula CH4. For the combustion of 237 g of methane we produce 802.3 KJ of heat energy

Question

how much heat do we produce?

write and balance the equation

classify the reaction type and endo/exothermic

what does enthalpy indicate

write the balanced equation showing energy as a reactant/product

Answer 1

Combustion is the reaction of the compound with oxygen to produce carbon dioxide and water.  In order to answer questions about heat, enthalpy, etc., one must write the balanced equation first.

CH₄ + 2O₂ ===> CO₂ + 2H₂O  balanced equation

 

How much heat is produced?

The problem states that 802.3 kJ of heat is produced. So that presumably is the answer. 

 

Classify the type and endo/exothermic?

Of course, the type of reaction is COMBUSTION, and since heat (energy) is produced/liberated, it is EXOTHERMIC

 

What does enthalpy indicate?

What a silly question.  Enthalpy is heat at constant pressure.

 

The balanced equation showing energy as a reactant/product:

CH₄ + 2O₂ ===> CO₂ + H₂O + heat energy