Snapquiz - Empirical Formula

This is the Snapquiz on Empirical Formula. Click here or use the embedded video if you haven't watched the lesson yet.


Question 1. How would you find the mass increase due to oxygen in the oxidation of magnesium?

Subtract the mass after oxidation from the mass before oxidation.
Find the ratios of the masses before and after oxidation.
Add the masses before and after oxidation together.
Subtract the mass before oxidation from the mass after oxidation.


Question 2. Sulphur has an Ar value of 32 and oxygen has an Ar value of 16. A sulphur oxide contains 6.4g of sulphur and 6.4g of oxygen. What is the empirical formula of the sulphur oxide?

SO
SO2
S2O
S2O2


Question 3. Butene contains four carbon atoms and eight hydrogen atoms. What is its empirical formula (not its molecular formula)?

CH2
C2H4
CH
C4H8


Question 4. A carbon oxide is found to have a 1:1 ratio of carbon to oxygen. What is its correctly-written empirical formula?

CO
CO2
C2O
C1O1


Question 5. 89.2g of lead oxide is heated with carbon, which reduces it (removes its oxygen). Afterwards 82.8g of pure lead is left. How would we find the mass of oxygen lost?

82.8g - 89.2g
Simplify the ratio 89.2 : 82.8
Divide both values by Ar values.
89.2g - 82.8g


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