Calculating Percentage Mass
1.Write out the formula (MgO)2.Then write the atomic mass of each element.(Mg=24 &O=16)3.Add the atomic masses up to get the RFM.4.Intotal there is 40g of Mg0, 24g is Mg and 16g is O) Then 24 divided by 40 x 100= 60% of MgO is Mg.Same for O=40%
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