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molecular physics – summer task

Task 3. When 20 ml mixture of O2 and O3 is burned, the volume became 29 ml and invisible in basis Pyrogallol solution. What is the volume in% of Oxygen gas in real mixture?
A

The reaction equation
2O3 → 3O2
x+y=20
3/2 x+y=29
Thus,
1/2 x=29-20=9
So,
x=2(9)=18.
y=20-18=2.
The volume % of Oxygen gas in real mixture is
2/20 100%=10%.

3 years ago
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