# In the formula #H_2O_2 -> H_2O + O_2#, how many grams of #O_2# are produced from the decomposition of 68 g of #H_2O_2#?

##### 1 Answer

#### Explanation:

**Your equation is not correctly balanced**. The correct equation is as follows:

First, calculate the **moles of** **reacting**. In order to do this, we must evaluate the **relative molecular mass** (

Next, we must compare the moles of **hydrogen peroxide** and **oxygen gas**. According to the corrected equation, this **mole ratio** is as shown below:

Thus, the moles of oxygen produced in this reaction will be exactly *half* the moles of hydrogen peroxide reacting.

Finally, convert from moles into mass, given that