In this lesson, we will learn how to define formula mass and calculate its value for given molecular formulas using atomic masses.

Students will be able to

Q1:

Which of these substances has the largest formula mass?

Q2:

What is the relative formula mass ()Mr of NaO2 (sodium oxide)? [Na=23, O=16]

Q3:

What is the Mr of silane (SiH)4?

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