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. Which is the correct sequence of values to calculate to find the empirical formula?

Ratio, Ar values, Masses, Division.
Ar values, Division, Ratio, Masses.
Division, Masses, Ar values, Ratio.
Masses, Ar values, Division, Ratio.


Question 2. A carbon oxide is found to have a 1:1 ratio of carbon to oxygen. What is its correctly-written empirical formula?

C1O1
CO
C2O
CO2


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

CH
CH2
C2H4
C4H8


Question 4. 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 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?

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


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