contd...

c)Percent excess air

In order to calculate percent excess air, first we have to calculate theoretical air.  Theoretical air is the air required for complete combustion of the following reactions:

	(1)
	(2)

We note that both CO and H₂ require 0.5 mole of oxygen. Hence

Theoretical amount of air at NTP

Alternatively excess air can also be calculated from excess oxygen in POC, since theoretically oxygen in POC will appear only when it is excess than theoretical in this problem

The slight difference in excess air may be due to rounding off.

d)%H₂O in POC

From the reaction 2 we get straightway that a mole of hydrogen gives 1 mole of water, hence