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H2(g)+12O2(g)⟶H2O(l)BE(H-H)=x1;BE(0=0)=x2;BE(O-H)=x3Latent heat of vaporization of water liquid into water vapor = x4then ΔfH ( heat of formation of liquid water) is

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a

x1+x22−x3+x4

b

2x3−x1−x22−x4

c

x1+x22−2x3−x4

d

x1+x22−2x3+x4

answer is C.

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Detailed Solution

Detailed Solution: Following is the Born Haber cycle for the formation of water.ΔH=∑(BE)R-∑(BE)PΔH=x1+x22-2x3-x4

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