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2Mg + O2 ==> 2MgO
massa Mg = 6 gram
Ar = 24
mol Mg = massa/Ar = 6/24 =0,25 mol
dari reaksi mol Magnesium oksida = mol Mg
= 0,25mol
mol MgO = 0,25 mol
Mr = 40
massa MgO = Mol x Mr
= 0,25 x 40
= 10 gram
jadi massa Magnesium Oksida yang dihasilkan adalah 10 gram