Is this formula right

Potasium sulfate+ barium chloride-> barium sulfate + potassium chloride

K2S + BaCl ---> BaS + K2Cl

Is that right?

Sulfate is SO4 and has a -2 charge
So, potassium sulfate would be K2SO4

Barium has a 2+ charge and chlorine has a -1 charge
Barium chloride would be BaCl2

results in:
K2SO4 (aq) + BaCl2(aq) ---> BaSO4(s) + 2 KCl (aq)

no your equation is wrong.

try to match the atoms on the both sides.. the number of atoms and mass never change in reaction.. correct reaction would be :

K2SO4 + BaCl2 --> BaSO4 +2 KCl

Nope.
K2SO4 + BaCl2 --> BaSO4 +2 KCl