Use bond energies to estimate the enthalpy change for the reaction of one mole o

Question

Use bond energies to estimate the enthalpy change for the reaction of one mole of CH_4 with chlorine gas to give CH_3CI and hydrogen chloride. BE(C - H) = 414 kJ/mol BE(C - CI) = 326 kJ/mol BE(H-CI) = 432 kJ/mol BE(Cl - CI) = 243 kJ/mol A) +331 kJ/mol B) -106 kJ/mol C) +106 kJ/mol D) -101 kJ/mol E) +101 kJ/mol Which one of the following pairs are isoelectronic? A) Mn^2+ and Ar B) Zn^2+ and Cu^2+ C) Cl^- and S D) K^+ and Cl^- E) Na^+ and K^+ Which of the elements listed below has the highest first ionization energy? a) He B) Ne c) Ar D) Kr E) Xe

Explanation / Answer

28, CH4 + Cl2 CH3Cl + HCl

= (4 C-H + 1 Cl-Cl) - (3 C-H + 1 C-Cl + 1 H-Cl)

= (1 C-H + 1 Cl-Cl) - (1 C-Cl + 1 H-Cl)

= (414 + 243 – 326 – 432) kJ/mol = -101 kJ/mol

29 Ans : d

30, Ans : a

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