What coefficient is needed in front of the Carbon (C) in the reactants in order to balance the equation?

C + 2SO2 --> CS2 + 4CO

5
6
4
3

Hint: The number of atoms in the reactant, must equal the number of atoms in the product, for each element

5. First option

Explanation:

The number of atoms in the reactant, must equal the number of atoms in the product, for each element

C + 2SO₂ → CS₂ + 4CO

In product side you have 1 C from the sulfure and 4 C from the CO.

As you have 5C in the product side, you need 5C in the reactant side.

the balanced equation is: 5C + 2SO₂ → CS₂ + 4CO