Question

138. If the air contains 20% of oxygen by volume and all
volumes are measured at the same conditions of
temperature and pressure, then the volume of air
required to burn 2 dm of ethane is
(a) 3.5 dm3
(b) 7 dm3
(c) 27 dm3
(d) 35 dm​

Answer 1

Answer:

35 DM is the correct answer please mark me as brainiest

Answer 2

The amount of oxygen present in air is given to be 20 percent but the amount of air is not mentioned thus the amount of oxygen is not required thus calculate the amount of oxygen required by simple method of chemical reaction