ICSE Class 10 Chemistry 2017 Solved Paper

Question : 60

Total: 86

Propane burns in air according to the following equation:
C3H8+5O2→3CO2+4H2O
What volume of propane is consumed on using 1000cm3 of air, considering only 20% of air contains oxygen?

Solution:

C3H8	+	5O2	→	3CO2	+	4H2O
1	:	5	::	3

20% of oxygen in 1000cm3 of air =200cm3 .

5 vol. Oxygen uses for 1 vol C3H8 .

200 vol. Oxygen uses for ‌

×200
=40cm3

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