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 two as a percentage of five?

40%.
50%.
60%.
30%.


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 percentage mass of all the carbon atoms in a CH4 molecule?

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


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

5.
7.
4.
6.


Question 4. Which of the following is a use of calculating percentage mass?

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


Question 5. What is one twentieth as a percentage?

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


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