# How do you balance the equation: #ZnS + O_2 -> ZnO + SO_2#?

##### 1 Answer

You know that

#### Explanation:

Because chemical equations CONSERVE mass;

And since there are 3 moles of oxygen on the right hand side (RHS) of the equation, there must be 3 moles of oxygen on the LHS:

If you dislike the 1/2 integral coefficient, on the LHS, you can simply double the entire equation:

Is this balanced? It must be if it represents a VALID chemical reaction.

Note that you do this sort of thing, this assessment of stoichiometry, ALL the time. If you buy an item for

See here for more details, and here for an example regarding combustion.