# Chemistry

what is the gram formula mass of Mg(C103)2?

help!

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3. 👁 87
1. 191.2068.

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2. how did you get that answer ?

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3. Mg(ClO3)2. You look up the atomic masses on the periodic table and add them.
Mg is approximately 24.3
Cl = 35.45 x 2= ?
O = 16 x 6 = ?

I go here and it adds them for me.
http://environmentalchemistry.com/yogi/reference/molar.html#Calculator

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4. But not in an exam! It is worth doing the problems using data from a Periodic Table or a data table so that you are familiar with the RAM of some common elements. Using a Periodic Table also reinforces where the elements are in the Periodic Table.

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posted by Dr Russ

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