Find the enthalpy change for the reaction 4NH3(g) + 5O2(g) --> 4NO(g) + 6H2O(g)
when:
N2(g) + O2(g) --> 2NO(g) ΔH = -180.5 kJ
N2(g) + 3H2(g) --> 2NH3(g) ΔH = -91.8 kJ
H2 + 1/2O2 --> H2O(g) ΔH = -241.8 kJ

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°