Question

How do you balance H2+O2-->H2O?

Answer 1

`2H_2 + O_2 rarr 2H_2O`

Explanation:

With `O_2` on the left side the right side will need to have an even multiple of `H_2O` to balance the oxygen.

This means that there will be 4 times some multiple of hydrogen on the right side.

The simplest way to to have 4 times a multiple of hydrogen from the let side using `H_2` is with `2H_2`