Snapquiz - Formula Mass and Moles

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?

32.
2.
16.
1.

Question 2. 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?

48.
24.
12.
36.

Question 3. 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?

16.
12.
52.
24.

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

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

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

If you would like to track your scores, please enter your preferred first name into the box (please note, this uses cookies to store the data on your computer/phone/tablet - please see the FAQ for more information). Alternatively, if your teacher has given you a code starting with a # symbol, you can enter that: