How do I find the products or these following reactants?

Na2CO3 +HCl

C6H12O6

CuSO4

AgNO3 + NaI

Na_2CO_3 is sodium carbonate -- a base.

HCl[math] is an acid.

Bases react with acids to form water and salts.

[math]Na_2CO_3 + 2 HCl \rightarrow H_2CO_3 + 2 NaCl \rightarrow H_2O + CO_2 + 2 NaCl

I'm not sure what you intended to conven with

C_6H_12O_6 which is the formula for sugar.

or

CuSO_4 copper sulfate.

Silver halides (silver chloride, silver bromide, and silver iodide) are insoluble and precipitate out.

AgNO_3 + NaI \rightarrow NaNO_3 + AgI(s)