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


Question 2. A hydrogen atom has a relative atomic mass of 1 and an oxygen atom has a relative atomic mass of 16. What's the mass of all the oxygen atoms in an H2O molecule?

2.
32.
16.
1.


Question 3. 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?

5.
10.
3.
4.


Question 4. A hydrogen atom has a relative atomic mass of 1 and an oxygen atom has a relative atomic mass of 16. What's the mass of one mole of H2O?

16kg.
18g.
16g.
20kg.


Question 5. Which number from an entry in the periodic table is the one involved in formula mass calculations?

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


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