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mol MgO = massa(gr)/Mr = 40/ (24 + 16) = 1 mol
2 Mg + O2 => 2MgO
M 1 mol x -
Rx 1 mol 0,5 mol 1 mol
S - x-0,5 mol 1 mol
oksigen yang terpakai adalah 0,5 mol
massa(gram) = mol * Mr
= 0,5 mol * 16
= 8 gram