Which coefficient is needed in front of nano3 to balance the equation na2s + zn(no3)2 → zns + _nano3?

Coefficient    is the  number   in front of a formula  in a balanced chemical equation.

For equation to balance the  number of  atoms in product side  must  be equal  to  number  of  atoms  in reactant  side.

Putting  coefficient 2   in front  of NaNO3  balance  the equation  therefore the balanced equation.           the answer is 2

answer is a

explanation:

2%? i tried finding the exact sorry if it's not 100% correct ; -;