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?

16.
2.
1.
32.


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. What is the mass number equal to?

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


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

It contains two hydrogen atoms and zero oxygen atoms.
It contains two hydrogen atoms and one oxygen atom.
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 and an oxygen atom has a relative atomic mass of 16. What's the mass of one mole of H2O?

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


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