CBSE Class 11-science Answered
If the bond enthalpies of X2,Y2 and XY are in the ratio 1:2:4 and delta Hformation of XY = -200kJ,find the bond enthalpy of Y2
Asked by aruni_maiyer | 23 Oct, 2010, 02:28: PM
Expert Answer
Let us consider that,
Bond Enthalpies(BE) of X2=a
Bond Enthalpies(BE) of Y2=2a
Bond Enthalpies(BE) of XY=4a
Reaction can be written as:
1/2X2+1/2Y2 ...................> XY
ΔH=BE of Reactants - BE of products
=1/2 BE of X2+1/2 BE of Y2 - BE of XY
-200=(a/2+2a/2)-4a
a=80 kJ/mole
Answered by | 25 Oct, 2010, 12:08: AM
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