To **calculate # of SO _{3}^{2-} ions **given mass:

** Mole-to-mole comparison:** 1 mole of SO_{3}^{2-} in 1 mole of Na_{2}SO_{3}

**Avogadro’s number = 6.022 x 10 ^{23} entities**

** entities = atoms, ions, molecules, particles, formula units**

How many SO_{3}^{2-} ions are contained in 99.6 mg of Na_{2}SO_{3}? The molar mass of Na_{2}SO_{3} is 126.05 g/mol.

a. 1.05 x 10^{21} SO_{3}^{2-} ions

b. 4.76 x 10^{20 }SO_{3}^{2-} ions

c. 9.52 x 10^{20} SO_{3}^{2-} ions

d. 1.52 x 10^{27} SO_{3}^{2-} ions

e. 2.10 x 10^{21} SO_{3}^{2-} ions

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