Snapquiz - Percentage Mass

This is the Snapquiz on Percentage Mass. Click here or use the embedded video if you haven't watched the lesson yet.


Question 1. What needs to be true about a chemical equation before we can calculate percentage mass?

It needs to be labelled.
It needs to be balanced.
It needs to be converted into a word equation.
It needs to be reversible.


Question 2. What is one twentieth as a percentage?

50%.
5%.
15%.
10%.


Question 3. 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 4. How many hydrogen atoms are there in the compound C2H5OH?

6.
7.
4.
5.


Question 5. A carbon atom has a relative atomic mass of 12 and a hydrogen atom has a relative atomic mass of 1. What's the percentage mass of all the carbon atoms in a CH4 molecule?

60%.
75%.
50%.
40%.


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