example
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#1: 75.0-g sample = 20.5 g C, 54.5 g O
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#2: 135.0-g sample = 67.5 g C, 90.0 g O
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are they the same?
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(20.5 g C / 75.0 g total ) • 100 = 27.3% C
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(67.5g C / 135.0 g total ) • 100 = 50.0% C
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they are not the same!
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