Question

Which reactions are endothermic? (Select all that apply.)

H2(g) + ½O2(g) H2O(g), H = -57.83 kcal/mole
½ N2(g) + ½O2(g) NO(g), H = +21.6 kcal/mole
½N2(g) + O2(g) + 8.1 kcal NO2(g)
½N2(g) + 3/2 H2(g) NH3(g) + 11.0 kcal/mole
NH3(g) ½N2(g) + 3/2 H2(g), H = +11.0 kcal/mole

Answer 1

@F_Jayyy

Answer 2

everything except the last to ones with 1/2 in front of N2

Answer 3

two*