# How many liters of oxygen will be obtained from the decomposition of 1 g of H2O2. if the gas is collected at 28 degrees celsius and 0.867 atm?

##### 1 Answer

You will obtain 0.42 L of oxygen.

#### Explanation:

There are four steps involved in this stoichiometry problem:

**Step 1. Write the balanced chemical equation.**

**Step 2. Convert grams of #"H"_2"O"_2# to moles of #"H"_2"O"_2#**

**Step 3. Convert moles of #"HCl"# to moles of #"O"_2#**

**Step 4. Calculate the volume of #"O"_2#**

For this calculation, we can use **Ideal Gas Law**:

#color(blue)(barul|stackrel(" ")( pV = nRT)|)#

WE can rearrange this formula to give

#V = (nRT)/p#

∴

The volume of

**Note**: The answer can have only one significant figure, because that is all you gave for the mass of

However, I carried the calculation to two significant figures.

Here's a useful video on mass-volume conversions.