Snapquiz - Formula Mass and Moles

This is the Snapquiz on Formula Mass and Moles. Click here or use the embedded video if you haven't watched the lesson yet.


Question 1. What is the mass number equal to?

The total number of protons and electrons.
The total number of neutrons, protons, and electrons.
The total number of protons and neutrons.
The number of protons minus the number of neutrons.


Question 2. Lithium's most common isotope has a mass number of 7 and an atomic number of 3. How many neutrons are in this type of lithium atom?

3.
5.
10.
4.


Question 3. Which number from an entry in the periodic table is the one involved in formula mass calculations?

The biggest number.
The proton number.
The smallest number.
The atomic number.


Question 4. What does the formula H2O mean about a water molecule?

It contains two hydrogen atoms and one oxygen atom.
It contains two hydrogen atoms and zero oxygen atoms.
It contains one hydrogen atom and two oxygen atoms.
It contains two oxygen atoms and two hydrogen atoms.


Question 5. A hydrogen atom has a relative atomic mass of 1, a carbon atom has a relative atomic mass of 12 and an oxygen atom has a relative atomic mass of 16. What's the formula mass of a CH3OH molecule?

64.
32.
22.
24.


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