Conversions: Grams to Atoms/Molecule/Ions

(and vice versa)

1

Grams, Moles, and Particles

A molar mass factor and Avogadro’s number convert• grams to particles.

atomic or molar mass Avogadro’s number grams moles atoms or molecules

2

Solution

How many H2O molecules are in 24.0 g H2O?

3

Solution

How many H2O molecules are in 24.0 g H2O?

24.0 g H2O x 1 mole H2O x 6.02 x 1023 H2O molecules 18.02 g H2O 1 mole H2O

= 8.02 x 1023 H2O molecules

4

Learning Check

If the odor of C6H10S can be detected from 2 x 10-13 g in one liter of air, how many molecules of C6H10S are present?

5

Solution

If the odor of C6H10S can be detected from 2 x 10-13 g in one liter of air, how many molecules of C6H10S are present?

2 x 10-13 g x 1 mole x 6.02 x 1023 molecules 114.21 g 1 mole

= 1 x 109 molecules C6H10S

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