CH4 + 2 O2 → CO2 + 2 H2O
What’s the total energy

80.2114/mol

Explanation:

that is the answer that I got using my chemistry calculator so I hope it works for your question.

Explanation:

An endothermic reaction occurs in a chemical cold pack. If you mix methane and oxygen together, a reaction isn't a straight away reaction. There is a barrier to the reaction. This barrier is due to the fact that to make CO2 and H2O break 4 carbon-hydrogen bonds and some oxygen-oxygen bonds.

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6