Question

balance the chemical equation

Answer 1

(a) FeS + 2HCl gives FeCl2 + H2S
(b) Na2Co3 + 2HCl gives 2NaCl + H2O + Co2

Answer 2

a) number of Cl molecules on RHS is 2
so add 2 as coefficient of HCl on LHS
now you can find that the number of atoms of each element on both sides are equal

b)number of Na molecule in LHS is 2, on RHS is 1
so as 2 as a coefficient of NaCl. it becomes 2NaCl
now number of Clothes molecules of RHS is 2 because we added 2 as coefficient
so as 2 as coefficient of HCl in LHS
so now you can check the number of atoms of all elements
they are equal

hope it helps you.
pls mark brainliest