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. 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.
1.
2.
16.


Question 2. What needs to be true about a chemical equation before we can calculate percentage mass?

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


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 mass of all the carbon atoms in a C3H8 molecule?

24.
24.
48.
36.


Question 4. 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%.
40%.
50%.


Question 5. Which of these numbers is the only one which could be a correct answer when calculating a percentage on a foundation level GCSE Science paper?

-10%.
64%.
170%.
500%.


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