# In the equation #2KClO_3 -> 2KCl + 3O_2#, if 5.0 g of #KClO_3# is decomposed, what volume of #O_2# is produced at STP?

##### 1 Answer

Apr 3, 2016

#### Explanation:

Find the relative mass of the molecule

Divide the total mass of the substance by its relative mass to find the number of moles of the substance.

There are two moles of

One mole of an ideal gas at STP (standard temperature and pressure) occupies 22.4L.

Multiplying

which should be your final answer, depending on how you've rounded.