Posted by Lyssa on Saturday, February 4, 2012 at 2:08am.
Look at the periodic table and add up the atomic masses. For example,
CO2 is 44.
C = 12; O = 16 x 2 = 32 and 32 + 12 = 44
I have rounded the numbers. Use the number of significant figures you need when you do it yourself. CO2 would be 44.01 if you wanted more accuracy.
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