The coefficient that is needed in front of NaNO3 to balance the equation is 2
Explanation
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 is as below.
Na₂S + Zn(NO₃)2 → ZnS + 2 NaNo₃.
The coefficient that has been needed in front of sodium nitrate has been 2. Thus, option B is correct.
The balanced chemical equation has been given as the equation that follows the law of conservation where the number of atoms of each element has been equivalent on both the product and the reactant side.
In the given equation, the number of atoms of each element has been:
Reactant = 2
Product = 1
Reactant = 1
Product = 1
Reactant = 1
Product = 1
Reactant = 2
Product = 1
Since, the amount of Na and Nitrate on the reactant side has been 2, while on the product side has been 1, the addition of the coefficient 2 at the product has been able to balance the equation.
Thus, the balanced equation has been:
[tex]\rm Na_2S\;+\;Zn(NO_3)_2\;\rightarrow\;ZnS\;+\;2\;NaNO_3[/tex]
Thus, the coefficient that has been needed in front of sodium nitrate has been 2. Thus, option B is correct.
For more information about the balanced equation, refer to the link:
https://brainly.com/question/7181548
