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Question

Calculate the percent composition of the following compounds.

Part 1-

Sodium Sulfate

____ % Na

____ % S

____ % O

Part 2-

Dinitrogen Tetroxide

_____ % N

_____ % O

Answer 1

Sodium sulfate = Na₂SO₄

Na = 23 g/mol x 2 = 46

S = 32 g/mol x 1 = 32

O = 16.0 g/mol x 4 = 64

Total = 142 g/mol for Na₂SO₄

%Na = 46g/142g (x100%) = 32.4%

%S = 32g/142g (x100%) = 22.5%

%O = 64/142 (x100%) = 45.1%

You should be able to do Dinitrogen tetroxide by yourself given the formula is N₂O₄