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. 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?

1.
2.
16.
32.


Question 2. A carbon atom has a relative atomic mass of 12 and a hydrogen atom has a relative atomic mass of 1. What's the mass of one mole of CH4?

16g.
24g.
52g.
12g.


Question 3. 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.
24.
22.


Question 4. Which number from an entry in the periodic table is the one involved in formula mass calculations?

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


Question 5. What is the mass number equal to?

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


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