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yKpoI14uk [10]
3 years ago
13

How many moles of MgCl2 are there in 305 g of the compound? Answer and units

Physics
1 answer:
Alona [7]3 years ago
8 0
Wrong subject.  Expect that to be in chemistry.

Here it is:

One mole of a compound/element contains the weight in grams equal to the sum of the molecular mass.
For MgCL2,
Mg=24.30
Cl=35.45
so the molecular mass = 24.30+2*35.45=24.30+70.9=95.20 (approximately).
=>
One mole of MgCl2 weighs 95.20 g.

305 g of MgCl2 = 305/95.20 = 3.20 moles, to 3 significant figures

Edit: improved accuracy of atomic masses.
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