I need help completing and balancing equations Mg+O2 --> KOH + NHO3 --> Febr3 + KOH--> CuSO4 + Na--> C6H14+O2 --> smallest...

First reaction is
synthesis:

2Mg + O2 -->
2MgO

Second reaction is double replacement or
neutralization

KOH + HNO3 -->  KNO3  +
HOH

Third reaction would also be double
replacement

FeBr3 + 3 KOH --> Fe(OH)3  + 3
KBr

Fourth reaction is single
replacement:

CuSO4 + 2 Na  -->  Na2SO4  +
Cu

Last reaction is
combustion:

2 C6H14  +   19 O2  -->  12 CO2  + 14
HOH