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Originally Posted by Pip
I wouldn't be too sure that atomic weight of I2 = 2*atomic weight of I since some energy/mass is lost or gained in forming bonds. But since you are dealing with only two significant numbers here anyway it probably won't matter in this case. I'm off to sleep now, good luck Jess!
(And I've never been able to understand the lab instructors either.)
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The mass loss/gain for chemical reactions is completely negligible even when using a greater number of significant figures.