Na2SO+CaCO3+C-Na2CO3+CO+CaS

Rewrite and balance the above equation

2 Na2SO4 + CaCO3 + 2 C → 2 Na2CO3 + 3 CO + CaS

The balanced equation is:

2Na2SO4 + CaCO3 + C -> Na2CO3 + CO2 + CaS