Order Hydrolysis of salts of weak acid

Order Hydrolysis of salts of weak acid
33. At 40qC and a total equilibrium pressure of 1 atm, N2
O4(g) is dissociated to the extent of 60%: N2
O4(g) 2NO2(g).
Calculate the % dissociation at an equilibrium pressure of 5 atm
(a) ~42% (b) ~32% (c) ~48% (d) ~21%
34. For a certain gaseous equilibrium, n1
A(g) n2
B(g) n3
C(g) considering pressure in atmosphere KP
= 9.92 u 104
in
magnitude. KC = 32.55 (in magnitude) at 400qC. What is the value of ‘n in the equation KP
= KC(RT)’n
?
(a) 2 (b) 2 (c) 1 (d) 1
35. KC for the equilibrium system: CH3 COOH C2
H5 OH H2
O CH3 COOC2
H5 equals 4 at the room temperature. Calculate the weight in grams of ester formed when 92 g of ethanol and 180 g of CH3 COOH are initially
taken and allowed to come to equilibrium.
(a) 69 g (b) 104 g (c) 138 g (d) 158 g
36. One mole of HCl(g) 0.5 mole of O2(g) mixed and allowed to come to equilibrium : 4HCl(g) O2(g) 2Cl2(g) 2H2
O(g)
at 400qC. Equilibrium pressure = 1 atm. 0.39 mole of Cl2(g) is formed under equilibrium. Calculate KP
Order Hydrolysis of salts of weak acid
37. For the equilibrium of selenium vapour in dissociation Se6(g) 3Se2(g), KP
= 0.2 at 700qC. Calculate approximate
% dissociation of the vapour at 700qC and at an equilibrium pressure of 600 mm.
(a) 35% (b) 17% (c) 27% (d) 8%
38. Consider the equilibrium system: N2(g) O2(g) 2NO(g) . At T = 2675K; KC = KP
= 3.5 u 103
. Calculate the yield
of NO in percentage by volume from air at normal pressure (1 atm) (with 79.2% N2
and 20.8% O2
)
(a) 2.32% (b) 1.33% (c) 1.56% (d) 3.67%
39. Consider the equilibrium system: PCl5(g) PCl3(g) Cl2(g) KP
(pressure in atmosphere) = 1.781 at 250qC. Calculate
no. of grams of PCl5(g) to be taken in a 5 litre vessel to get an equilibrium concentration of 0.05 mol litre1
of PCl5
.
(a) 87.66 g (b) 99.6 g (c) 105.51 g (d) 120.15 g
40. For the system [PCl5 PCl3 Cl2
] in equilibrium, KP
(calculated in atmosphere) = 1.781 at 250qC. If into a 5 litre vessel, already containing 0.2 mole of Cl2(g), 0.2 mole of PCl5(g) is introduced what may be the degree of dissociation D
(a) 0.242 (b) 0.224 (c) 0.422 (d) 0.122
6.50 Chemical and Ionic Equilibria
41. KP
for the equilibrium: CO2(g) C(s) 2CO(g) is 122.0 at 1000qC. Calculate mole % of CO(g) and CO2(g) at a total
pressure of 12.2 atm.
(a) 82.6% , 17.4% (b) 72.7%, 27.3% (c) 75.2%, 24.8% (d) 91.6%, 8.4%
42. Consider the equilibrium system: SO3(g) SO2(g)
1
2
O2(g) At 400K, a 20 g sample of SO3
exhibited decomposition
of 45% at the equilibrium pressure of 1 atm. Calculate