Week 13
2. For parts of the free response question that require caleulations, clearly show the method used and the steps involved in arriving at your answers. You must show your work to receive credit for your answer. Examples and equations may be included in your answers where appropriate.
Answer the following questions related to NH_(3).
N_(2)(g)+3H_(2)(g)⇄2NH_(3)(g),Delta H_(209)^(**)=-92.2k(J)/(m)ol_(rai)Delta S_(29s)^(+)=-198.8(J)/(mol_(rat)-K)
(a) The reaction of N_(2)(g) and H_(2)(g) to form NH_(3)(g) is represented above. The reaction has been studied in order to maximize the yield of NH_(3)(g). /_(/)G=Delta H-7Delta S
(i) Calculate the value of Delta G^(**), in k(J)/(m)ol_(ran ), at 298K.
(ii) Calculate the value of the equilibrium constant, K_(p), at 298K.
able[[Bond,Average Bond Enthalpy (kJ/mol)],[N-H,391],[H-H,436],[N-=N,?
Week13
Answer the following questions related to NHg
Calculate the valuc of Gin kJ/molran.at 298K
Bond N-H H-H N=N
Average Bond Enthalpy(kJ/mol 391 436 ?
NN bond cnthalpy.
Sand their effect on G Ng+3Hg=2NHg e) Although the forward reaction represented above is thermodynamically unfavorable at very high temperatures it can be used to produce NHg if the NH is continually removed from the reaction vessel.Explain in terms of Q and K why this method works. The boiling points of H and NH are given in the table below. Substance Boiling Point H2 20K NH3 240K
