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.
16.
2.
1.


Question 2. Which of the following is a use of calculating percentage mass?

Using experimental data to find which elements are in a compound.
Using experimental data to tell two compounds apart from each other.
Using experimental data to predict which compounds we'll produce.
Using experimental data to calculate the chemical formula of a compound.


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?

48.
24.
36.
24.


Question 4. 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.
The numerator.
The small number.
100%.


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?

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


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