Question

How many moles of oxygen will be needed to combust 20.50 moles of C7H16?

Answer 1

225.5 mol O₂

Procedure

Assuming the complete combustion of heptane, we will consider the following reaction for our calculations.

C₇H₁₆ + 11 O₂ → 7 CO₂ + 8 H₂O

The moles of oxygen can be determined by stoichiometry

`20.50\text{ mol C}_7\text{H}_(16)\frac{11\text{ mol O}_2}{1\text{ mol C}_7\text{ H}_(16)}=225.5\text{ mol O}_2`