Answer: 1.6 moles of C2H6 are required to react with 5.6 O2.
Step-by-step explanation:
According to the balanced reaction
2c2h6 + 7o2⟶4co2 + 6h2o
2 moles of C2H6 are required to react with 7 moles of O2 so accordingly by the unitary method 1.6 moles of C2H6 will be required.