Magnesium oxide is 60.3% magnesium by mass. What is the mass fraction of magnesium in magnesium oxide? a. 0.603
b. 0.397
c. 39.7
d. 60.3
e. None of these

A. 0.603

Explanation:

Mass fraction of an element in a substance = mass of that element / total mass of the substance.

Mass of magnesium = 24.3g/mol

Mass of oxygen = 16g/mol

Total mass of MgO = 24.3+16 = 40.3g/mol

Hence, the mass fraction of magnesium in Magnesium oxide =

24.3/40.3

= 0.6029

= 0.603

Another way is to divide the percentage by mass of magnesium by 100 i.e. 60.3% = 60.3/100

= 0.603

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explanation:

the maximum mass of nh3 is nh3 in grams