# 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 is one twentieth as a percentage?

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

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

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

Question 3. Which number goes on the bottom of your fraction when you're calculating a percentage on a foundation level GCSE Science paper?

The large number.
100%.
The numerator.
The small number.

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?

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

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 mass of all the carbon atoms in a C3H8 molecule?

24.
36.
24.
48.