I think its c Am i Correct ?

Question

When table sugar is burned in presence of oxygen, carbon dioxide and water vapor are produced according to the unbalanced chemical equation: C12H22O11(s) + O2(g)→ CO2(g) + H2O(g) How many moles of oxygen are required to react completely with 2.70 mol of sugar?

a. 2.70

b. 47

c. 32.4

d. 65

e. None of these

Answer 1

Hello, Anjela,

C₁₂H₂₂O₁₁(s) + O₂(g)→ CO₂(g) + H₂O(g)

This equation is not balanced. I see 12 carbon atoms going in, but only 1 going out.

C₁₂H₂₂O₁₁(s) + 12O₂(g)→ 12CO₂(g) + 11H₂O(g)

Looks better. The balanced equation says it takes 12 moles of oxygen for every 1 mole of C₁₂H₂₂O₁₁. If we have 2.7 mole of sugar, we will consume 18.9 moles of oxygen.

Bob

(2.7 moles C₁₂H₂₂O₁₁)* (7 moles O₂)/( 1 mole C₁₂H₂₂O₁₁) = 32.4 moles C₁₂H₂₂O₁₁

Very good. I get the same answer.

Bob