___NH4Cl + ___Ba(OH)2→___NH3+___BaCl2+___H2O

___HNO3 +___Al(OH)3→___Al(NO3)3+___H2O

___Cu+___HNO3-->___Cu(NO3)2+___H2O+___NO2

can someone explain how I would balance these equations?
I know how to balance some equations, but these just confuse me.. .

Have a look here : another post about the same subject on this same board . LINK (https://www.askmehelpdesk.com/math-sciences/balancing-equations-277237.html)

:)

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Post back if you still have difficulties, but try balancing first, and where you're stuck.