Snapquiz - Percentage Mass

Question 1. 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?

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

Question 2. 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.

Question 3. What is one twentieth as a percentage?

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

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

7.
4.
6.
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?

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

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