KIM 110–2021 PRACTICE FINAL EXAM NAME AND SURNAME

KIM 110–2021 PRACTICE FINAL EXAM NAME AND SURNAME




1

KIM 110–20-21

Practice final exam


Name and Surname :

No :

Signature :


QUESTIONS



  1. Substance A decomposes by a first-order reaction. Starting initially with [A] = 2.00 M, after 126 min [A] = 0.250 M. For this reaction, what is (a) t1/2 ; (b) k ?


  1. TKIM 110–2021 PRACTICE FINAL EXAM NAME AND SURNAME
    he initial rate of the reaction A + B C + D is determined for different initial conditions, with the results listed in the following table.

Expt [A],M [B],M Initial rate ( Ms-1)

1 0.185 0.133 3.35 x 10 -4

2 0.185 0.266 1.35 x 10 -3

3 0.370 0.133 6.75 x 10 -4

4 0.370 0.266 2.70 x 10 -3


  1. What is the order of the reaction with respect to A and B ?

  2. What is the overall reaction order ?

  3. What is the value of the rate constant, k ?


  1. WKIM 110–2021 PRACTICE FINAL EXAM NAME AND SURNAME
    KIM 110–2021 PRACTICE FINAL EXAM NAME AND SURNAME
    hen 1.00 mol I    2(g) is introduced into an evacuated 1.00- L flask at 1200 oC, 5% of the I2 molecules dissociate into iodine atoms. For the reaction I2(g) 2I(g) at 1200 oC What are the values of (a) Kc and (b) Kp ?

  2. Equilibrium is established at 1000 K, where Kc = 281 for the reaction

2KIM 110–2021 PRACTICE FINAL EXAM NAME AND SURNAME
KIM 110–2021 PRACTICE FINAL EXAM NAME AND SURNAME
SO2(g) + O2(g) 2SO3(g). The equilibrium amount of O2(g) in 0.185-L flask is 0.00247 mol. What is the ratio of [SO2] to [SO3] in the equilibrium mixture?


  1. What is the (a) degree of ionization and (b) percent ionization of propionic acid in a solution that is 0.45 M HC3H5O2 ?

HKIM 110–2021 PRACTICE FINAL EXAM NAME AND SURNAME
KIM 110–2021 PRACTICE FINAL EXAM NAME AND SURNAME
C3H5O2 + H2O H3O+ + C3H5O2- pKa = 4.89

6. Calculate the pH at the points in the titration of 25.0 mL of 0.132 M HNO2 when (a) 10.0

mL and (b) 20.0 mL of 0.116 M NaOH have been added. For HNO2, Ka = 7.2 x 10-4.


HKIM 110–2021 PRACTICE FINAL EXAM NAME AND SURNAME
NO2 + OH- H2O + NO2-

7. Use VSEPR theory to predict the geometric shapes of the following molecules and

ions; (a) N2 , (b) HCN , (c) NO3-, (d) NSF.


8 Nicotine extracted from tobacco leaves, is a liquid completely miscible with water at

temperature below 60 oC. (a) What is the molality of nicotine in an aqueous solution that

starts to freeze at – 0.450 oC? (b) If this solution is obtained by dissolving 1.921 g of

nicotine in 48.92 g H2O, what must be the molar mass of nicotine? (Kf = 1.86 oC/m)


9. Tungsten(W) has a body-centered cubic crystal structure. Using a metallic radius of 139

pm for the W atom, calculate the density of tungsten.


10. The following first-order reaction occurs in CCl4 (l) at 45 oC.:

NKIM 110–2021 PRACTICE FINAL EXAM NAME AND SURNAME
2O5 N2O4 + ½ O2 (g). The rate constant is k = 6.2 x 10-4 s-1. An 80 g sample

of N2O5 in CCl4(l) is allowed to decompose at 45 oC.


  1. How long does it take for the quantity of N2O5 to be reduced to 2.5 g ?

  2. How many liters of O2, measured at 745 mmHg and 45 oC, are produced up to this point.









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