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A gas mixture of 3.67 lit of ethylene and methane on complete combustion at 25^@C and at 1 atm pressure produce 6.11 lit of carbon dioxide. Find out the amount of heat evolved in kJ, during this combustion. (DeltaH_C(CH_4)=-890 "kJ mol"^(-1)) and (DeltaH_C(C_2H_4)=-1423 "kJ mol"^(-1)) .

Answer» <html><body><p></p><a href="https://interviewquestions.tuteehub.com/tag/solution-25781" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUTION">SOLUTION</a> :Given : <br/> `DeltaH_C(CH_4)=-<a href="https://interviewquestions.tuteehub.com/tag/890-1929934" style="font-weight:bold;" target="_blank" title="Click to know more about 890">890</a> "kJ mol"^(-1)` <br/> `DeltaH_C(C_2H_4)=-1423 "kJ mol"^(-1)` <br/> Let the mixture containx lit of `CH_4` and (3.67-<a href="https://interviewquestions.tuteehub.com/tag/x-746616" style="font-weight:bold;" target="_blank" title="Click to know more about X">X</a>) lit of ethylene . <br/> `underset" x lit"(CH_4)+2O_2 to underset"x lit"(CO_2) + 2H_2O` <br/> `underset"(3.67-x)lit"(C_2H_4 + 3O_2) to underset"2(3.67-x)lit"(2CO_2 + 2H_2O)` <br/> Volume of <a href="https://interviewquestions.tuteehub.com/tag/carbon-16249" style="font-weight:bold;" target="_blank" title="Click to know more about CARBON">CARBON</a> dioxide formed =x +2 (3.67 -x) =6.11 lit <br/> x+7.34 -2x =6.11 <br/> x=1.23 lit <br/> Given mixture <a href="https://interviewquestions.tuteehub.com/tag/contains-11473" style="font-weight:bold;" target="_blank" title="Click to know more about CONTAINS">CONTAINS</a> 1.23 lit of methane and 2.44 lit of ethylene , hence <br/> `DeltaH_C=[(DeltaH_C(CH_4))/"22.4 lit"xx(x)"lit"]+[(DeltaH_C(C_2H_4))/"22.4 lit"xx(3.67-x)"lit"]` <br/> `DeltaH_C=[(-890"kJ mol"^(-1))/"22.4 lit"xx"1.23 lit"]+[(-1423)/"22.4 lit"xx(3.67-1.23)"lit"]` <br/> `DeltaH_C=[-48.87 "kJ mol"^(-1) ]+[-155 kJ "mol"^(1)]` <br/> `DeltaH_C=-203.87 "kJ mol"^(-1)`</body></html>


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