Answer:
2HCl+Na_2S_2O_3=2NaCl+H_2O+S+SO_2
Step-by-step explanation:
First balance Na
On the right side gf the equation there are 2Na, so on the left side it should be equal.
So HCl+Na_2S_2O_3=2NaCl+H_2O+S+SO_2
Then do the same with Cl and move on with the atoms.