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. 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?

10.
5.
4.
3.

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 formula mass of a CH4 molecule?

52.
16.
12.
24.

Question 3. What does the formula H2O mean about a water molecule?

It contains two oxygen atoms and two hydrogen atoms.
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.

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 all the oxygen atoms in an H2O molecule?

2.
1.
16.
32.

Question 5. 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?

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

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