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MAGNESIUM+OKSIGEN⇒MAGNESIUM OKSIDA
6gram ? 10gram
massa zat-zat sebelum reaksi sama dengan massa zat setelah reaksi.
massa magnesium+massa oksigen⇒massa magnesium oksida
6gram+massa oksigen⇒10gram
massa oksigen=massa magnesium oksida-massa magnesium
=10gram-6gram
⇒massa oksigen=4gram