ICSE Class 10 Chemistry 2018 Solved Paper

Ethane burns in oxygen to form ${\CO}_2$ and ${\H}_2 {\O}$ according to the equation :

2 {\C}_2 {\H}_6+7 {\O}_2 → 4 {\CO}_2+6 {\H}_2 {\O} .

If 1250 cc of oxygen is burnt with $300 {\cc}$ of ethane.
Calculate:

Question : 70 of 80

Marks: +1, -0

the volume of unused

{\O}_2

Solution:

If 2 vol. of

{\C}_2 {\H}_6

burnswith 7 vol. of

{\O}_2

then

300 {\cc}

{\C}_2 {\H}_6

burnswith

\;{7}/{2} × 300

=1050 {\cc}

Total

{\O}_2=1250 {\cc}

(given)
Vol. of

{\O}_2

used

=1050 {\cc}

∴ \;\text " Vol. of unused "\; {\O}_2\;=1250-1050

\;=200 {\cc} .

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