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What a good question! This is where significant figures come into play. When you write 30 g, you are only allowed to use 2 significant figures to answer the question versus 30.0 g which allows you to write 3 sig figs. Also writing 30.0 g makes the measurement more precise and shows you that it is exactly 30.0 g instead of 30.4 g or something like that. It is important to be as precise as possible especially when it comes to very small numbers.
30 is just one sig fig, 30. would be two, and 30.0 would be three. A decimal indicates the tailing zeroes to be significant (e.g. 30. or 30.0). You can also use scientific notation to make sure sig figs are correct. You should check out Lavelle's "Everything you want to know about Sig Fig" file under Course Materials.
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