Answer:
The answer to your question is: No, this equation is not balanced.
Step-by-step explanation:
To know if a equation is balanced, we must know the Lavoisier law of conservation of mass that states that " In an isolated or closed system, matter can not be created or transform".
This means that that matter in the reactants is equal to the mass in the products.
Equation
S + 3O₂ ⇒ SO₃
Reactants Products
1 sulfur 1 sulfur
6 oxygens 3 oxygens
As the amount of oxygens in the reactants is higher than in the products, the equation is not balanced.