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Yes, but you also have to pay attention to how many molecules of each element are in the compound.

For instance: H2O (water)

The weight of H is roughly 1 and the weight of O is roughly 16, but formula weight of water is NOT equivalent to just 1 + 16 = 17

You have to be sure that you account for the total amount of molecules so since there are 2 H present you have to multiply the weight of H by 2; 1 x 2 = 2

Now you have the weight of all the H present and just add that to the weight of the single O molecule

2 + 16 = 18; thus the formula weight of water is 18.

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13y ago

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