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Question: H<sub>2</sub>(g) + \(\frac{1}{2}\)O<sub>2</sub>(g) ® H<sub>2</sub>O (l) B.E (H – H) = x<sub>1</sub>...

H2(g) + 12\frac{1}{2}O2(g) ® H2O (l)

B.E (H – H) = x1, B.E (O = O) = x2 ; B.E (O – H) = x3

Latent heat of vaporisationof water liquid into water vapour = x4 then DHf (that of formation of water) is –

A

x1 + x22\frac{x_{2}}{2}– x3 + x4

B

2x3 – x1 – x22\frac{x_{2}}{2}– x4

C

x1 + x22\frac{x_{2}}{2} – 2x3­ – x­4

D

x1 + x22\frac{x_{2}}{2} – 2x3 + x4

Answer

x1 + x22\frac{x_{2}}{2} – 2x3­ – x­4

Explanation

Solution

DH = SB. ER – SB.Ep