Question

100 cc. each of water gas and oxygen are ignited and the resultant mixture of gases cooled to room temp. Calculate the composition of the resultant mixture. [Water gas contains CO and H2 in equal ratio]

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Answer

Vol of CO = 50 cc and H2 = 50 cc [As Water gas contains CO and H2 in equal ratio] and O2 = 100 cc

[By Lussac’s law]

CO    +   H2   +   O2    →   CO2   +   H2O

1 vol  :  1 vol   :  1 vol  →  1 vol    :   1 vol

To calculate the amount of O2 used,

CO        :   O2

1 vol     :   1 vol

50 cc    :   x cc

As ratio between CO and O2 is same so, O2 used is 50 cc.

Hence, remaining O2 = 100 – 50 = 50 cc.

To calculate the amount of CO2 produced,

CO        :   O

1 vol     :   1 vol

50 cc    :   y cc

1 vol of CO produces 1 vol. of CO2
Hence, CO2 produced = 50 cc.

Therefore, the resultant mixture has 50 cc of O2 + 50 cc of CO2

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