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29 July, 17:40

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

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  1. 29 July, 19:50
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    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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