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OpenStudy (anonymous):
Determine the molecular weight for Mg(NO3)2.
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OpenStudy (jfraser):
looks up the molar mass of each piece from the periodic table and add them together
OpenStudy (joannablackwelder):
Also, make sure you multiply the molar mass my the number of that element you have. For example, molar mass of N *2 since you have 2 of them in the compound.
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