Lesson: Formula Masses

In this lesson, we will learn how to calculate formula masses by summing the relative atomic masses of the constituent elements.

Worksheet: 6 Questions

Q1:

A sample of neon contains (mass 19.9924 u), (mass 20.9940 u), and (mass 21.9914 u). Calculate to 4 significant figures the average atomic mass of neon in this sample.

Q2:

A sample of magnesium contains (mass 23.98 u), (mass 24.99 u), and (mass 25.98 u). Calculate the average atomic mass of magnesium in this sample.

Q3:

What is the molar mass of methane ()?

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