Question

chosse the correct answer (show your work)

A-Using the following data reactions:

	ΔH° (kJ)
H2(g) + Br2(g) → 2HBr(g)	-103
H2(g) → 2H(g)	432
Br2(g) → 2Br(g)	193

calculate the energy of an H-Br bond.

522 kJ

52 kJ

261 kJ

728 kJ

364 kJ

B-Given the following information:

	Li(s) → Li(g)	enthalpy of sublimation of Li(s) = 166 kJ/mol
	HF(g) → H(g) + F(g)	bond energy of HF = 565 kJ/mol
	Li(g) → Li+(g) + e–	ionization energy of Li(g) = 520. kJ/mol
	F(g) + e– → F–(g)	electron affinity of F(g) = -328 kJ/mol
	Li+(g) + F–(g) → LiF(s)	lattice energy of LiF(s) = -1047 kJ/mol
	H2(g) → 2H(g)	bond energy of H2 = 432 kJ/mol

Calculate the change in enthalpy for:

2Li(s) + 2HF(g) → H₂(g) + 2LiF(s)

184 kJ

-1064 kJ

-556 kJ

-680 kJ

None of these choices are correct.