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यदि XY, `X_(2)` तथा `Y_(2)` ( सभी द्विपरमानुक अणु ) की बांध वियोजन उर्जाये `1:1:05` के अनुपात में हो तथा XY के लिए `Delta_(f)H` का मान -200 किलजूल मोल`""^-1 ` हो, तो `X_(2)` की बांध वियोजन ऊर्जा क्या होगी ?
A. 800 किलजूल मोल`""^1 `
B. 200 किलजूल मोल`""^1 `
C. 300 किलजूल मोल`""^1 `
D. 400 किलजूल मोल`""^1 `

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Best answer
Correct Answer - A
दिया है, `1/2X_(2)+1/2Y_(2)to XY,DeltaH==-200` किलोजूल
माना की `X_(2), Y_(2)` तथा XY की वियोजन उर्जाये है ---
`a,a/2,a` ( अनुपात दिया है | )
`X_(2)to2X," "DeltaH=a" "…(2)`
`Y_(2)to2Y," "DeltaH=a/2" "...(2)`
`XYtoX+Y," "DeltaH=-a" "...(3)`
समीकरण `(1)+(2)-2xx(3)` से,
`DeltaH=a+a/2-2a=-a/2`
या `1/2X_(2)+1/2Y_(2)toXY,`
`DeltaH=a/2+a/4-a=-a/4`
`:." "-a/4=-200`
`:." "a=800` किलोजूल मोल`""^-1 `

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