Final answer:
To combust 4.50 moles of C2H6, you would need 15.75 moles of O2.
Step-by-step explanation:
In the combustion of C2H6, the balanced equation is:
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
From the balanced equation, we can see that for every 2 moles of C2H6 combusted, we need 7 moles of O2. Therefore, if we have 4.50 moles of C2H6, we would need:
(7 moles O2 / 2 moles C2H6)(4.50 moles C2H6) = 15.75 moles of O2