The bond energies for H_2 (g) and HF (g) are 435 and 565 kJ/mol, For the reactio

Question

The bond energies for H_2 (g) and HF (g) are 435 and 565 kJ/mol, For the reaction: 1/2 H_2 (g) + 1/2 F_2 (g) rightarrow HF (g), the heat of reaction is -268 kJ/mol of HF produced. What is the kilojoules per mole? a. -80 b. 80 c. 138 d. 159 e. 243 In the Icl_4^- ion, how many electrons are there about the central a. 4 b. 6 c. 8 d. 10 e. 12 In phosgene, Cl_2 CO, the electron pairs are located about the ________ arrangement. a. pyramidal b. tetrahedral c. trigonal planar d. trigonal bipyramidal c. square planar The electronic geometry of the nitrite ion, NO_2^-, is best described as a. bent. b. trigonal planar. c. tetrahedral. d. pyramidal. c. trigonal pyramidal. All the following species would be expected to have a tetrahedral a. BF_4^-. b. CF_4. c. NF_4^+. d. SiF_4. e. CIF_4^-. The molecular shape of the CH_3^- ion is best described as a. pyramidal. b. bent. c. tetrahedral. d. trigonal planar. e. linear. Mark answer "b".

Explanation / Answer

Ans 17. d . 159

Energy is required to break the bonds and released when the bonds are formed.

The net sum of these energies in a reaction determines the enthalpy of the reaction .

So here enthalpy of the reaction -268 KJ equals to

-268 = (1/2 x 435) + (1/2 x F-F) + (-565)

1/2 F-F = 79.5 KJ

So the bond energy of 1 mole of F2 = 79.5 x 2 = 159 KJ/mol

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