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jadi yang baris pertama:
masa Mg = 0.72 gram ⇔ mol = 0.03
jadi mol Mg = mol MgO karna perbandingan koefesiennya sama.
maka masa MgO = 1,2 gram
baris kedua:
massa MgO=2,8 gram ⇔ mol MgO = 0,07
jadi masa Mg = 1,68 gram ; masa O = 1,12 gram
baris ketiga:
masa O = 1,5 gram⇔ mol O=0,09375
jadi masa Mg = 2,25 gram.