- #1

brbrett

- 35

- 0

## Homework Statement

Hydrogen peroxide breaks down easily to give water and oxygen as follows:

2H

_{2}O

_{2}

_{(aq)}----> 2H

_{2}O

_{2(l)}+ O

_{2(g)}

Bottles of hydrogen peroxide are sometimes labelled as 10 volume as well as 3%. This means the volume of oxygen that can be liberated is 10 times the volume of the solution. Remembering that 1 mol at STP of any gas occupies 22.4L, calculate the volume of oxygen at STP that could be produced from 1L of a 3% solution. Is 10L a good approximation to your answer?

## Homework Equations

2H

_{2}O

_{2}

_{(aq)}----> 2H

_{2}O

_{2(l)}+ O

_{2(g)}

3% refers to 3g/100mL

Mole equations and density

## The Attempt at a Solution

Knowing that I have a 1L solution, I make 3g/100ml into 30g/L.

Working from there, I divide 30g H

_{2}O

_{2}by the molar mass, 34g/mol, to find moles of H

_{2}O

_{2}.

The equation states there is a 2:1 ratio between hydrogen peroxide and oxygen, so I divide the moles by 2.

I then multiply the moles of Oxygen by 22.4 to find the volume, which I find is 9.88L (in line with the question's estimate of 10L as well).

I quite literally just thought of this possible solution when I was posting this for help. I'm uncertain as to whether or not I went about this properly, particularly in finding the grams of H

_{2}O

_{2}in the 1L solution.

As always, appreciate any help on the matter.