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? [C=12g/mol, H=1g/mol, O=16g/mol, Na=23g/mol, Br=80g/mol, Cl=35.5g/mol, F=19g/mol ,N=14g/mol]
Q2:
What is the relative formula mass ()Mr of NaO2 (sodium oxide)? [Na=23, O=16]
Q3:
What is the Mr of phosphorus trifluoride (PF)3? [P=31, F=19]
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