Sample: How many grams of Chlorine gas are produced by 2.925 grams of sodium chloride?

2 NaCl ==> 2 Na + 1 Cl2

Solution: (a) where do you start? (b) where are you going? (c) what steps will get you there?

2.925 gram NaCl
1

x

_1 mole NaCl_
58.5 gram NaCl

x

1 Cl2__
2 NaCl

x

70.9 grams Cl2
1 mole Cl2

=

1.77 grams Cl2

Mole ratio: What you want OVER what you started with, so that it CANCELS !

© 1977 James M. Liptrap

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