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WorksheetsUPS 3 SK015 SEMESTER I SESSION 2020/2021
Total questions: 20
Worksheet time: 30mins
Which of the following statements is NOT a statement of the Kinetic Molecular Theory?
The unit for temperature is in Kelvin.
Volume of gas molecules are negligible.
The collisions between the gas particles are elastic.
The volume occupied by a gas increases with temperature.
Under what condition does hydrogen gas deviates from an ideal gas behaviour?
Temperature : Low
Pressure : High
Temperature : High
Pressure : Low
Temperature : Low
Pressure : Low
Temperature : High
Pressure : High
At a fixed volume. The gas pressure in a vessel is 2.0 atm at 25 ⁰C. Find the pressure if it is heated to 250 ⁰C.
[Ideal gas constant, R = 8.314 J mol-1 K-1 ; R = 0.08206 L atm mol-1 K-1]
[Pressure : 1 atm = 760 mmHg = 760 torr = 101 325 Pa = 101 325 N m-2]
[Temperature 0 ⁰C = 273.15 K]
1.14 atm
3.51 atm
20.0 atm
35.1 atm
A sample of gas exert 1000 torr of pressure at 333 K has the mass of 3.00 g. If the molar mass of the gas sample is 28 g/mol, calculate the volume occupied by this gas.
[Ideal gas constant, R = 8.314 J mol-1 K-1 ; R = 0.08206 L atm mol-1 K-1]
[Pressure : 1 atm = 760 mmHg = 760 torr = 101 325 Pa = 101 325 N m-2]
[Temperature 0 ⁰C = 273.15 K]
2.23 L
2.42 L
22.3 L
240 L
A mixture of 40.0 g oxygen and 25.0 g nitrogen gas are placed in a closed vessel of 8.10 L at 25 ⁰C. Calculate the total pressure of the mixture.
[Ideal gas constant, R = 8.314 J mol-1 K-1 ; R = 0.08206 L atm mol-1 K-1]
[Pressure : 1 atm = 760 mmHg = 760 torr = 101 325 Pa = 101 325 N m-2]
[Temperature 0 ⁰C = 273.15 K]
0.38 atm
0.54 atm
6.47 atm
6.65 atm
Which of the following statements is not true about gas?
When the ideal gas molecules collide, there is no kinetic energy loss.
Pressure exerted by the real gas is more than that of an ideal gas.
The attractive forces between gas molecules for an ideal gas are negligible.
At a constant pressure and number of mole, the volume occupied by an ideal gas is directly proportional to temperature.
Under the same temperature and pressure, the particles in a sample of liquid ____________________________.
have the same strength of intermolecular forces.
have the same tendency to evaporate.
have the same average kinetic energy
have the same vapour pressure.
Which of the following quantities is independant to the strength of attractive forces between liquid molecules?
solubility
surface tension
viscosity
vaporisation
I only
I and II
II and III
I, II and III
I only
I and II
II and III
I, II and III
solid
liquid
gas
supercritical fluid
freezing, then condensation
melting only
sublimation only
melting, then boiling
A, as concentration decreases
B, as concentration decreases
A, as concentration increases
B, as concentration increases
What is the Kc expression for this reaction?
2NO(g) + O2(g) ⇌ 2NO(g)
Kc = [NO2]
[NO][O2]1/2
Kc = [NO]2[O2]
[NO2]2
Kc = [NO][O2]1/2
[NO2]
Kc = [NO2]2
[NO]2[O2]
What is the equilibrium constant, Kc expression for reaction
Fe3O4(s) + 4H2(g) ⇌ 3Fe(s) + 4H2O(g)
[Fe]3 [H2O]4
[Fe3O4] [H2]4
[H2O]4
[H2]4
[Fe3O4] [H2]4
[Fe]3 [H2O]4
[H2]4
[H2O]4
At 830 °C, the value of Kp for the equilibrium
2SO2 (g) + O2 (g) ⇌ 2SO3 (g)
is 0.13. What is the value of Kp for
2SO3 (g) ⇌ 2SO2 (g) + O2 (g)
0.36
2.8
7.7
59
The following reaction
SO2 (g) + NO2 (g) ⇌ SO3 (g) + NO (g)
had reached a state of equilibrium. It was found to contain 0.15 mol L-1 of NO2 , 0.20 mol L-1 of SO2, 0.40 mol L-1 of SO3 , and 0.30 mol L-1 of NO. Calculate the equilibrium constant, Kc for this reaction.
4.0
0.40
0.25
2.5
The equilibrium constant, Kp for the reaction
2NO2(g) ⇌ 2NO(g) + O2(g)
is 158 at 1000 K. Calculate PO2 if PNO2= 0.400 atm and PNO= 0.270 atm.
867 atm
234 atm
346 atm
72 atm
The reaction
HCOOH(g) ⇌ CO(g) + H2O(g)
has Kp = 1.6 x 106 at 673 K. Calculate the value of Kc for the reaction at this temperature.
[Ideal gas constant, R = 0.08206 L atm mol-1 K-1]
5.2 x 102
2.9 x 104
8.8 x 107
2.2 x 105
At the start of reaction, there are 0.0711 M of N2, 9.17 x 10-3 M of H2, and 1.83 x 10-4 M of NH3 in 3.5 L reaction vessel at 375 °C. If the equilibrium constant, Kc for the reaction
N2(g) + 3H2(g) ⇌ 2NH3(g)
is 1.2 at this temperature, calculate Qc and predict the direction that the net reaction will shift to reach equilibrium.
1.64, shift to the right
1.64, shift to the left
0.611, shift to the right
0.611, shift to the left
