Question

Question 22 For the following reaction, what is An required in the conversion of K to K,? (2 marks) N,(g) + 3H,(g) = 2NH,(g) A) 4 B) -4 C) -2 D) 2 E) 1

Answer 1

Kp and ke are the equilibrium constant of gaseous mixture. However, the difference between the two constants is that ke is defined by molar concentration, whereas kp is defined by the partial pressures of the gasses respectively. ely.

let's take an example. 3 - cct do where a, b, cod are stoichiometric coefficients. x [c] [ord [c] = Molar concentration of a [A]a[B] [D] = Molar concentration of TAJ= Molar concentration of A [B] = Molar concentration of B. kezequilibrium constant.

um Another example (Ganeous Reaction) QA (3) + bB (g) = C(5) + dD (8) Now: equilibrium constant K ()' ()* (Pa) a (b) • Pc, PB, PA and o are the partial pressures of Al Blo C, B, A and respectiely.

of above geneous reaction o Now, if we assume that each of these elements are behave as an ideal gan, then we should write: PV = nRT (ideal gas equation] 78= ~ RT 1 P = pressure of the gas Na volume of the gas > P2 @.RT. na naumber of moles of gas moleute Ra universal gas constant - Molar concentration T= temperature

Molar concentration can be defined as the th number of moles of an chemical species per unit volume, asesolution, ko (Pege (P ) d | We should write (PAja (Pob Pe - C.RT / CC = [c] Po=CORT {}=[D] PA= CART CA - [A] PB 2 GBRT C6- [B] e d (etd)-(ath where CA, CB, C, ce are the Molare concentration of A, B,D and c elements respectively B (Rt) at Kp Fm 103*

We can relate the kp and keby :- (c+d) - (ath) (RT) AN > Kp = ke (RT) in where ke [c] [Dj d [4) "[B]" 4n = number of moles of gaseous products - number of moles of gaseous reactants.

The given reaction in question is- N₂ (9) + 3H₂ (9) ² 2NH3 (8) The above reaction is ganeous in nature The number of moles of gaseous product =2 The number of moles of gaseous reactant = (3+1) = 4. here, an= (2-4) 2 - 2

We know, & Kpa Ke(RT) AN * koke (RT) -2. I for is the above reaction, the values of an is -2 which required to in the conversion of ke to kp.