To calculate # of SO32- ions given mass:
Mole-to-mole comparison: 1 mole of SO32- in 1 mole of Na2SO3
Avogadro’s number = 6.022 x 1023 entities
entities = atoms, ions, molecules, particles, formula units
How many SO32- ions are contained in 99.6 mg of Na2SO3? The molar mass of Na2SO3 is 126.05 g/mol.
a. 1.05 x 1021 SO32- ions
b. 4.76 x 1020 SO32- ions
c. 9.52 x 1020 SO32- ions
d. 1.52 x 1027 SO32- ions
e. 2.10 x 1021 SO32- ions
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