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?

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


Question 2. What's the next step once you've found the mass in grams of an element in your compound and its Ar value?

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


Question 3. 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 4. A carbon oxide is found to have a 1:1 ratio of carbon to oxygen. What is its correctly-written empirical formula?

C2O
CO
C1O1
CO2


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

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


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