A. 2 Na(s)+O2(g)→Na2O2(s)2 ~\mathrm{Na}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{g}) \rightarrow \mathrm{Na}_{2} \mathrm{O}_{2}(\mathrm{s})2 Na(s)+O2(g)→Na2O2(s)
B. 2 Mg(s)+O2(g)→2 MgO(s)2 ~\mathrm{Mg}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{g}) \rightarrow 2 ~\mathrm{MgO}(\mathrm{s})2 Mg(s)+O2(g)→2 MgO(s)
C. 3 Mg(s)+N2(g)→Mg3N2(s)3 ~\mathrm{Mg}(\mathrm{s})+\mathrm{N}_{2}(\mathrm{g}) \rightarrow \mathrm{Mg}_{3} \mathrm{N}_{2}(\mathrm{s})3 Mg(s)+N2(g)→Mg3N2(s)
D. 2 NaN3(s)→2 Na(s)+3 N2(g)2 ~\mathrm{NaN}_{3}(\mathrm{s}) \rightarrow 2 ~\mathrm{Na}(\mathrm{s})+3 ~\mathrm{N}_{2}(\mathrm{g})2 NaN3(s)→2 Na(s)+3 N2(g)
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