Mg→MgO→MgSO4→Mg(OH)2→MgO→Mg

Question

Mg→MgO→MgSO4→Mg(OH)2→MgO→Mg

Answer 1

2Mg + O2 -> 2MgO
MgO+H2SO4=MgSO4+H2O
Mg(NO3)2+H2O=Mg(OH)2+HNO3
Mg(OH)2 = MgO + H2O
2MgO =2 Mg + O2