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OpenStudy (anonymous):
How many formula units of magnesium sulfate heptahydrate (MgSO4 x 7H20) are present in 6.28g?
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OpenStudy (anonymous):
Got a periodic table handy? Add up all the atomic weights and divide 6.28 by that number. That will give you number of moles of the substance.
OpenStudy (anonymous):
You have to then multiply number of moles by Avogadro's number to get the number of molecules.
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