Answer:
2:1
Explanation:
2 hydrogen to 1 mole oxygen
Becouse melting point and cooling point are two opposite things one is 100degrees nd other 0degrees
An exothermic reaction<span> is a chemical </span>reaction<span> that releases energy by light or heat. It is the opposite of an </span>endothermic reaction<span>. Expressed in a chemical equation: reactants → products + energy.</span>
1s^2 2s^2 2p^6 3s^2 3p^1 (If you understand that)
The answer is D.
Hope this helps