Which reactions are endothermic? (Select all that apply.) A. H2 (g) + ½O2 (g) H2O (aq), H = - 57.83 kcal/mole

B. ½ N2 (g) + ½O2 (g) NO (g), H = + 21.6 kcal/mole

C. ½N2 (g) + O2 (g) + 8.1 kcal NO2 (g)

D. ½N2 (g) + 3/2 H2 (g) NH3 (g) + 11.0 kcal/mole

E. NH3 (g) ½N2 (g) + 3/2 H2 (g), H = + 11.0 kcal/mole

Question

Chemistry

Rigoberto Christensen

18 July, 00:35

Which reactions are endothermic? (Select all that apply.) A. H2 (g) + ½O2 (g) H2O (aq), H = - 57.83 kcal/mole

B. ½ N2 (g) + ½O2 (g) NO (g), H = + 21.6 kcal/mole

C. ½N2 (g) + O2 (g) + 8.1 kcal NO2 (g)

D. ½N2 (g) + 3/2 H2 (g) NH3 (g) + 11.0 kcal/mole

E. NH3 (g) ½N2 (g) + 3/2 H2 (g), H = + 11.0 kcal/mole

+4

Answers (1)

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Furball · Answer 1

Reactions B, C, D and E are endothermic since the enthalpy change for each is positive. When endothermic reactions occur, they absorb energy from the environment thus the overall energy change becomes positive (they are all preceded by a plus sighn, + )