2Mg + O2 = 2 MgO
X + 3X = 21
4X = 21g
X = 21:4= 5, 25g
magnez 5,25g tlen 21 g - 5,25= 15,75g
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2Mg + O2 = 2 MgO
X + 3X = 21
4X = 21g
X = 21:4= 5, 25g
magnez 5,25g tlen 21 g - 5,25= 15,75g