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
PO2.5
P2.5O
P2O5


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

CO
C1O1
CO2
C2O


Question 3. If a compound has a 1:2 ratio of carbon atoms to oxygen atoms, what is its chemical formula?

C2O.
OC2.
CO.
CO2.


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?

SO2
SO
S2O2
S2O


Question 5. What's the next step once you've found the mass in grams of an element in your compound and its Ar value?

Divide the mass by the Ar value.
Find the ratio of the mass to the ArSubtract the Ar value from the mass.
Find the ratio of the Ar values to each other.


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