Na2s(aq)+cu(no3)2(aq)→nano3(aq)+cus (s)
express your answer as a chemical equation. identify all of the phases in your answer.

Explanation:

              Na₂S+Cu(NO₃)₂ → NaNO₃+ CuS

To balance the above chemical equation,

 let us put coefficients a, b, c and d at the back of the compounds. The coefficients are needed to balance the equation of the reaction.

                 aNa₂S+bCu(NO₃)₂ → cNaNO₃+ dCuS

Conservation of Na: 2a = c

                            S:   a = d

                            N:   2b = c

                            O:  6b = 3c

    let a = 1, c = 2, b = 1 , d = 1

         Na₂S + Cu(NO₃)₂ → 2NaNO₃  +  CuS

The phases:

          Na₂S + Cu(NO₃)₂ → 2NaNO₃  +  CuS