ICSE Class 10 Chemistry 2018 Solved Paper

Ethane burns in oxygen to form CO2 and H2O according to the equation :
2C2H6+7O2→4CO2+6H2O.
If 1250 cc of oxygen is burnt with 300‌cc of ethane.
Calculate:

Question : 70

Total: 80

the volume of unused O2 .

Solution:

If 2 vol. of C2H6 burnswith 7 vol. of O2 then 300‌cc of C2H6 burnswith ‌

×300
=1050‌cc
Total O2=1250‌cc (given)
Vol. of O2 used =1050‌cc
∴‌ Vol. of unused ‌O2‌=1250−1050
‌=200‌cc.

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