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

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


Question 2. What does the formula H2O mean about a water molecule?

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


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 mass of all the carbon atoms in a C3H7OH molecule?

36.
24.
12.
48.


Question 4. What is the mass number equal to?

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


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.
22.
24.
32.


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