Does the law of conservation apply to burning fossil fuels

yes

Explanation:

While burning fossil fuels energy is under going a chemical reaction but the matter/energy itself is not being destroyed or created

The law of conservation applies to the burning fossil fuels

Explanation:

When you burn fossil fuels, some of the energy is transformed into other types of energy, and some of it is transferred to other objects, yet the energy is neither destroyed or created, so it applies to the law of conservation.

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;