Question

What's the formula for Li2Co3+Co(NO3)3(aq) ->

Answer 1

do you mean reaction?

Because cobalt carbonate is insolulbe, there is a reaction.

Li2CO3(aq)+Co(NO3)2(aq)..LiNO3 (aq)+Co2(CO3)3 (s).

Now, you need to balance it.