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

P1O2.5
P2.5O
P2O5
PO2.5


Question 2. Butene contains four carbon atoms and eight hydrogen atoms. What is its empirical formula (not its molecular formula)?

C4H8
CH
CH2
C2H4


Question 3. 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
S2O2
SO2
S2O


Question 4. 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 5. What is the Ar value of an element?

The charge on an atom.
The mass number of an atom.
The number of neutrons in an atom.
The proton number of an atom.


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