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Grade 12th passPhysical Chemistry

plz explain it..............................................................................................................................................................

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Profile image of Rameen Sattar
7 Years agoGrade 12th pass
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1 Answer

Profile image of Vikas TU
7 Years ago
Dear Student,
Given equation are
C2H4(g)+3O2(g) ---> 2C02+2H20(l)    ΔH =-1411KJ ............... (1)
2C2H6(g)+7O2(g) ---> 4CO2(G)+6H2O(l)  ΔH =-372.8 KJ............... (2) 
2H2(g)+O2(g) ---> 2H2O(l)    ΔH =-68.3 KJ.................(3)
The enthalpy of the following reaction can be calculated as
The required equation is
C2H4(g)+H2(g)  ---> C2H6(g)    ΔH = ?
Divide eqn. (3) by 2 and add to the eqn (1)
C2H4(g)+3O2(g) +H2(g)+ 1/2O2(g) ---> 2CO2+2H20 + H2O(l) 
ΔH= -(-337.2 -68.3/2) = 371.35 kJ/mol....................................(4)
Divide eqn. (2) by 2 and Subtract this eqn. from eqn. (4)
C2H4(g)+3O2(g)+H2(g)+1/2O2(g) -C2H6(g) - 7/2O2(g) -->2C02+2H20 +H2O(l) - 2CO2(G) - 3H2O(l)
ΔH = -371.35 - (-372.8/2) = -559.2 kJ/ mol
or, C2H4(g)+H2(g) ---> C2H6(g)  ΔH = -559.2 kJ/ mol

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