If the chemical equation below is balanced, what number would go in front of hydrochloric acid (HCD?

_CuCl2 + H2S → _Cus + _HCI

Coefficient 2 on HCl

Balanced equation: CuCl₂ + H₂S → CuS + 2HCI

Explanation:

We are required to balance the chemical equation given;

The equation is;

CuCl₂ + H₂S → CuS + HCI

Balancing chemical equations involves putting appropriate coefficients on the products and reactants involved in a chemical reactions. It ensures that the number of atoms of each element is equal; on both sides of a chemical equation.

In our case;

To balance the chemical equation, we put coefficients; 1, 1, 1, 2 on CuCl₂, H₂S, CuS and HCl respectively. Therefore, the balanced equation will be;

CuCl₂ + H₂S → CuS + 2HCI

The equation now obeys the law of conservation of mass which requires the mass of reactants be equal to the mass of products.