Question

For the reaction ? S + ? O2 → ? SO3 , balance the equation. If four moles of sulfur (S) are combined with six moles of oxygen molecules (O2), how many moles of SO3 will be produced? 1. three 2. five 3. four 4. one 5. six 6. two 7. seven

Answer 1

Answer:

3. four

Explanation:

balanced equation:

• 2S + 3O2 → 2SO3

∴ moles (n) S = 4 mol

∴ n O2 = 6 mol

limit reagent: S

⇒ mol SO3 = ( 4 mol S )*( 2 mol SO3 / 2 mol S )

⇒ n SO3 = 4 mol SO3