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. 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 2. 3.1g of phosphorus reacts with oxygen to make 7.1g of phosphorus oxide. What is the empirical formula of this oxide?

P1O2.5
P2O5
PO2.5
P2.5O


Question 3. 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.
89.2g - 82.8g
Simplify the ratio 89.2 : 82.8
82.8g - 89.2g


Question 4. Which is the correct sequence of values to calculate to find the empirical formula?

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


Question 5. A carbon oxide is found to have a 1:1 ratio of carbon to oxygen. What is its correctly-written empirical formula?

CO
C2O
CO2
C1O1


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