2. A reaction D + B prei hers is tound to be renth order in B and second order e
ID: 561951 • Letter: 2
Question
2. A reaction D + B prei hers is tound to be renth order in B and second order equation is k Ae In the Arrhenius equation, the units tthe dimensiones) of the a in D. The Arrhenius designated by A is/are: E) Cannot be determined from the information given 3. Consider the reaction Nd g) . Oz(g) 2 NO( g), for which Ke-0. 10 at 2,000C. Starting with initial concentrations of 0.040 M of N2 and 0.040 M of O,, determine the equilibrium concentration of NO. A) 5.4 10 M B) 0.0096 M C) 0.011 M D) 0.080 M E) 0.10 M strength decreases in the series 1II HSO, >HF HCN. Which of these species is the weakest base? Acid 5. In which of these gas-phase equilibria is the yield of products increased by increasing the total pressure on the reaction mixture? A) CO(g) + H20(g) B) 2NO(g)+ Cl2(g) CO2(g) +Hig) 2NOCl(g) D) PC15(g)# PCI)(g) + Cl2(g) E) None of the above 6. The reaction 2NO(g) N2(g) + Odg) is exothermic. AH ru"-180 kJ mol. Which one of these statements is true? A) Kp at 1,000 K is less than Kp at 2,000 K. B) Kp at 1,000 K is larger than Kp at 2,000 K. C) The Kp's at 1000 K and 2000 K are the same. D) Kp depends on total pressure as well as temperature. E) None of these is true. 7. Calculate the hydrogen ion concentration in a solution of iced tea with lemon having a pli of 2.87. A) B) C) 2.9 × 10-2 M 5.7 x 10-2 M D) 2.9 × 10-3 M E) 5.7 x 10 M -3 1.3 x 10 'MExplanation / Answer
2) The reaction is zero order in B and second order in D; the rate of the reaction is defined as rate of appearance of products. Therefore,
Rate = k[D]2
The rate has unit M.s-1 while D has unit M; therefore, k will have unit M-1s-1.
Again, k = A*exp(-Ea/RT)
The exponential term is dimensionless; hence A will have the same unit as k, i.e, M-1s-1 = 1/(Ms). (B) is the correct answer.
3) Set up the ICE chart as below.
N2 (g) + O2 (g) <======> 2 NO (g)
Initial 0.040 0.040 0
Change -x -x +2x
Equilibrium (0.040 – x) (0.040 – x) 2x
We have Kc = 0.10 = [NO]2/[N2][O2] = (2x)2/(0.040 – x).(0.040 – x)
====> 0.10 = 4x2/(0.040 – x)2
Take positive square root on both sides,
0.3162 = 2x/(0.040 – x)
====> 0.012648 – 0.3162x = 2x
====> 0.012648 = 2.3162x
====> x = (0.012648)/(2.3162) = 5.461*10-3
The equilibrium concentration of NO is 2*5.461*10-3 M = 0.010922 M 0.011 M. (C) is the correct answer.
4) The stronger a Bronsted acid, the weaker is the basicity of the conjugate base. Therefore, the strongest acid will have the weakest base and vice versa. All the ions except H2SO4 are the conjugate bases of the given acids. The conjugate base of HSO4- is SO42-. Infact, HSO4- is the conjugate acid of H2SO4.
H2SO4 is the strongest mineral acid when compared to the given protic acids and is therefore, the weakest base. Consequently, (E) is the right answer.
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