Snapquiz - Percentage Mass

Question 1. How many hydrogen atoms are there in the compound C₂H₅OH?

4.
7.
5.
6.

Question 2. What is one twentieth as a percentage?

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

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.
48.
36.
24.

Question 4. 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 balanced.
It needs to be labelled.

Question 5. 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.

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