Question

Methane (CH_4) gas is used for heating in many applications. It is gas used to fuel the Bunsen burners in this classroom. The chemical equation for the combustion of methane is given. Answer the following questions.

CH_4 + 2O_2 --> CO_2 + 2H_2O

1.) Will the ∆H for the combustion of methane be +890 kJ/mol or -890kJ/mol? Explain.

2.) Is energy a reactant or a product in this reaction?​

Answer 1

sign of ∆H :-

• +ve means endothermic reaction
• -ve means exothermic reaction

We know

when methane burns in presence of oxygen heat is released as a form of energy so the reaction is exothermic.∆H must be -ve

#2

• Product as energy is released so it will be in right side