how many moles of 02 are required to react completely with 6.9 moles C6H14, express your answer using two significant integers

About 66 moles

Explanation:

1. Chemical equation

The reaction of C₆H₁₄ with O₂ is the combustion of an hydrocarbon. Such reactions yield CO₂ and water.

The chemical equation is:

C₆H₁₄ + O₂ → CO₂ + H₂O

Which when balanced is:

2C₆H₁₄ + 19O₂ → 12CO₂ + 14H₂O

2. Mole ratio

The coefficients on the balanced chemical equation tell the relative amounts of each substance, reactants and products, that participate on the chemical reaction.

19 moles of O₂ react with 2 moles of C₆H₁₄

(19 mol O₂ / 2 mol C₆H₁₄) * 6.9 mol C₆H₁₄ = 65.55 mol O₂

Round to two significant figures: 66 mol of O₂ ← answer