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. 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
89.2g - 82.8g
Divide both values by Ar values.


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?

S2O
SO
S2O2
SO2


Question 3. 3.1g of phosphorus reacts with oxygen to make 7.1g of phosphorus oxide. What is the empirical formula of this oxide?

P2O5
P2.5O
PO2.5
P1O2.5


Question 4. Butene contains four carbon atoms and eight hydrogen atoms. What is its empirical formula (not its molecular formula)?

CH2
C2H4
CH
C4H8


Question 5. Which is the correct sequence of values to calculate to find the empirical formula?

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


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