Answer: [tex]2NaCl+CaS\rightarrow Na_2S+CaCl_2[/tex]
Explanation: The coefficients of [tex]a_0[/tex], [tex]a_1[/tex], [tex]a_2[/tex], and [tex]a_3[/tex] are 2, 1, 1 and 1 respectively.
According to the law of conservation of mass, the mass of the products must be same as the mass of the reactants in every chemical equation.
In order to do so , the number of atoms of every element must be same on both sides of the equation and thus the chemical equation is balanced.
