Question

In a chemical reaction, what is the number directly before each reactant, and each product?

Answer 1

`"The stoichiometric coefficient........."`

Explanation:

And thus for the reaction:

`2H_2(g)+O_2(g)rarr2H_2O(l)`,

we have `"stoichiometric coefficients"` of `2`, `1`, and `2` respectively for dihydrogen, dioxygen, and the water molecules.