Snapquiz - Formula Mass and Moles

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.
1.
2.
16.

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 formula mass of a CH₄ molecule?

12.
16.
24.
52.

Question 3. Which number from an entry in the periodic table is the one involved in formula mass calculations?

The biggest number.
The proton number.
The smallest number.
The atomic number.

Question 4. A hydrogen atom has a relative atomic mass of 1, a carbon atom has a relative atomic mass of 12 and an oxygen atom has a relative atomic mass of 16. What's the mass of all the carbon atoms in a C₃H₇OH molecule?

12.
48.
24.
36.

Question 5. Lithium's most common isotope has a mass number of 7 and an atomic number of 3. How many neutrons are in this type of lithium atom?

4.
3.
5.
10.

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