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H2+1/2o2-H2o BE=H-H=x1 B.Eo=o=×2 BE O-H=×3. heat of vapourisation of water=×4 heat of formation of liquid water is

H2+1/2o2-H2o BE=H-H=x1 B.Eo=o=×2 BE O-H=×3. heat of vapourisation of water=×4 heat of formation of liquid water is
 

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Grade:12th pass

1 Answers

Arun
25750 Points
4 years ago
 
Required reaction= Heat of formation of water – H2(g) +1/2O2 (g)= H2O(l)
WRITE THE EUATION PROPERLY FOR EACH EQUATION
 rearranging the reactions we have to get the above equation
B.E. of H--H= H2(g) → 2H(g)..........X1
B.E of O2 = O2(g) ---> 2O(g)...........X2
B.E. OF O-H = O-H(aq)--> O(g)+H(g) …......X3
LATENT HEAT OF VAPOURISATION OF WATER = H2O(l)----> H2O(g)..........X4
THUS REVERSING EQTN X3 AND X4 , HALVING EQUATION X2 AND DOUBLING EQUATION X3 WE WILL GET THE DESIRED EQUATION.
 

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