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Midterm

CHEM 1001 Study Guide - Midterm Guide: Benzoic Acid, Sodium Hydroxide, Conjugate Acid


Department
Chemistry
Course Code
CHEM 1001
Professor
all
Study Guide
Midterm

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Quiz 2 section N 1 March 2012
Marks
[5] 1 N2O3 (g) decomposes to NO (g) and NO2(g) with a H0 = 40.5 KJ mol-1 according to
the equilibrium: N2O3 (g) NO (g) + NO2 (g)
What effect will the following changes have on the position of the equilibrium?
Circle the correct answer
(a) More H2O3 (g) is added, volume stays fixed:
Shift left Shift right stay the same
(b) More NO2 (g) is added, volume stays fixed:
Shift left shift right stay the same
(c) The volume of the reaction flash is increased:
Shift left shift right stay the same
(d) The temperature is lowered:
Shift left shift right stay the same
(e) add He (g) while keeping the volume fixed:
Shift left shift right stay the same
[2] 2 consider the following reaction:
3H2 (g) + N2 (g) 2NH3 (g)
For this reaction the value of Kp is 6.5 x 10 -3 at 723 K. For the following mixture
indicate
If the system is at equilibrium, and if it is not, indicate the direction in which the
reaction
Will proceed to achieve equilibrium.
Pressure of NH3 = 60 atm, pressure of H2 = 150 atm, pressure of N2 = 80 atm
[5] 3 Calculate the pH and concentration of the benzoate ion in a 50 mM solution of
benzoic
acid (Ka = 6.3 x 10-5).
[9] 4 For the reaction PCL5 (g) PCL3 (g) + Cl2 (g), kp is 1.8 at 523 K.
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