2 Mg+ O2---> 2 MgO
mO2=32u
mMgO=24u+16u= 40u
32 g O2------- 2*40 g MgO
x g O2------- 10 g MgO
x=4 g O2
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2 Mg+ O2---> 2 MgO
mO2=32u
mMgO=24u+16u= 40u
32 g O2------- 2*40 g MgO
x g O2------- 10 g MgO
x=4 g O2