From the following data, calculate the average bond enthalpy for the N-H bond: NH3(g) → NH2(g) + H(g) ΔH
o
= 435 kJ/mol
NH2(g) → NH(g) + H(g) ΔH
o
= 381 kJ/mol
NH(g) → N(g) + H(g) ΔH
o
= 3.60 × 102 kJ/mol

Select the correct value for the indicated bond angle in each of the compounds. o−o−oo−o−o angle of o3 90° 109.5° < 109.5° 120° < 120° 180° f−b−ff−b−f angle of bf3 180° < 109.5° < 120° 120° 109.5° 90° f−o−ff−o−f angle of of2 < 120° 120° 90° 109.5° 180° < 109.5° cl−be−clcl−be−cl angle of becl2 90° 109.5° 180° 120° < 109.5° < 120° f−p−ff−p−f angle of pf3 90° 109.5° < 109.5° 180° 120° < 120° h−c−hh−c−h angle of ch4 90° < 109.5° 180° 120° < 120° 109.5°