Question

Ammonia (NH₃) decomposes to hydrogen and nitrogen and 22.0 kilocalories of energy was absorbed per mole of NH_3. Show your calculation by dimensional analysis.(10 pts)

                              2NH_{3 (g)}                3H_2(g)      +      N_2(g)      ΔH = + 22.0 kcal/mol

a. How much energy is absorbed when 50.5 kilograms of NH₃ was decomposed? Show your solution by dimensional analysis. (Answer = 65,400 kilocalories).         Molar Mass NH₃

                                                                                                                                                           N=1 x ____=_____

                                                                                                                                                           H=3 x ____=_____

                                                                                                                                                           MM =_____

                                                                                                                                                                                                                                                                                                                               

c. How many grams of nitrogen was generated when 2500 kilocalories of energy was absorbed?  

                                                                                                                                                             MM N₂

                                                                                                                                                               N=2 x__

                                                                                                                                                                MM=____

d. Draw the energy diagram of the reaction showing the reactants and products, heat of reactions of products and reactant, activation energy and transition state.

Answer 1

E (a given 2NH3 Ą + 3 He WH2 22Kcall mel 1 mole of NH3= lrg (molar mass of NH3 = 1791 md) Mass of whs in 50.5 kg - 50.5 kg = 50.5X6, z 2.97x10 ml 173/ml - Tgl mal energy released per mole= 22 Kcal/mol energy release by 297X163 mole = 22 Kcall thelix 297X163 phel = 65353 Kcal. Answer: ~65 400 kcal / (6 22 kcal is absorbed by Nk to generate į mole Nz. so l Keal is absorbed to release b = 1 mol Nz. so 2500 Keal is absorbed to release 2500 mole Naz 156.8 ml N2] 204 d) Energy level diagram TEAZ Activation T energy ENH2 I (Product) All e 22 kcal/mol. N₂ + 3H2 Creactant)