Question

Air contains 21% oxygen by volume. Determine the theoretical volume of the air required to burn completely 400 cubic meters of ethene gas .


CH2=CH2 + 3O2----->2CO2+2H2O​

Answer 1

One cubic meter of ethene=3 cubic meter of oxygen.

400 cubic meter of ethene = 3×400 cubic meter of oxygen

=1200 cubic meter of O2

Hence quantity of air required = 100×1200/21=5714.3 cubic metre.

Answer 2

Answer:

For 1 liter of methane, 2 liter of oxygen is needed.

However in 1 liter of air,

there is only 200 ml of oxygen found.

In 10 liter of air,

2 liter of oxygen will be found.

Thus, 10 liter is needed. 22. 4liter,

if CH4 need 44.8 liter of oxygen.

The methane under same condition need 10 liter.