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Physical Chemistry Questions CH107
Part 2 Dr Cussen

1
...
Which of the following statements is FALSE?
(a)

The two gases exert the same partial pressure
...


(c)

If the temperature of the container is then increased from 100ºC to

200ºC, the pressure will be exactly doubled
...


The number of atoms of nitrogen present is exactly double that of Ne
...
5
...
382 g sample of a liquid was found to produce 92
...
What is the molar mass of the liquid?

(a)
(b)

74 g mol-1

(c)

80 g mol-1

(d)

99 g mol-1

(e)

3
...
50 g cm−3
...
95 cm3 of chloroform
are allowed to completely evaporate in a sealed container of volume 8
...
What will the pressure due to chloroform be inside the container?
(a)

50
...
00 × 104 Pa

(c)

9
...
50 × 104 Pa

(e)

5
...
Which of the following statements is INCORRECT?

pV/RT

4
...
2
Ne

Ideal Gas

1
...
8
Pressure/atm
200

400

600

800

(a)

The number of moles of gas considered is exactly 1
...


(c)

The increase in the value of pV = nRT at high pressures is associated
with the increase in the real volume occupied by the gas
...


(e)

The effective decrease in n for Xe at ~200 atm pressure is due to
attractive forces between the Xe atoms
...


The vapour pressure of the pure solvent 2-propanol, pº = 5
...
When 8
...
96 × 104 Pa
...


29 g mol−1

480 g mol−1

What is the root mean square speed of H2O(g) molecules at 100°C?

(a)
(b)

482 m s−1

(c)

516 m s−1

(d)

719 m s−1

(e)

7
...
7 m s−1

516853 m s−1

When added together, cyclohexane (C6H12) and n-hexane (C6H14) give a
miscible mixture
...
If the liquid mixture contains 21
g of cyclohexane and 43 g of
n-hexane, the mole fraction of n-hexane in the vapour phase at 42°C is:
(a)

0
...
75

(c)

0
...
60

(e)

0
...


Given that the ebullioscopic constant for water is K1000 = 0
...
5°C?
(a)
(b)

2
...
0

(d)

0
...


1
...
50

The density of metallic copper is given in some text books as 8
...
In
SI units, this is:
(a)
(b)

8
...
96 × 10−3 kg cm−3

(d)

8960 g dm−3

(e)

10
...

Which of the following statements is FALSE?
(a)

The two gases exert the same partial pressure
...


(c)

If the temperature of the container is then increased from 100ºC to

200ºC, the pressure will be exactly doubled
...


(e)

The mole fraction of nitrogen is equal to 0
...


11
...
75 g of a compound to 750 g of CCl4 lowered the freezing
point of this solvent by 10
...
Given that the cryoscopic constant K’1000 for
CCl4 is 30
...


210 g mol−1

165 g mol−1

The density of hydrogen gas at 20ºC and 200 atm pressure is:
(a)
(b)

8
...
67 × 10−2 kg m−3

(d)

8350 kg m−3

(e)

13
...
67 × 104 kg m−3

16
...
0 × 104 Pa at 611
K
...
62 g of an involatile compound is dissolved in 250 g of this
solvent, the vapour pressure fell to 4
...
Applying Raoult’s Law,
the molar mass of the compound is:

(a)

29 g mol−1
(b)

210 g mol−1

(c)

620 g mol−1

(d)

270 g mol−1

(e)

480 g mol−1

14
...
0 m s-1

(c)

411 m s-1

(d)

21115 m s-1

(e)

15
...
76 m s-1

168921 m s-1

What is the number of molecules in 25 g of water?
(a)
(b)

2
...
0 × 1023

(d)

8
...


1
...
1 × 1024

A 0
...
1 cm3 vapour,
measured at 18°C and 1 atm pressure
...


60 g mol-1

101 g mol-1

A balloon is filled with helium at 2
...
What is the density of the gas in the balloon?
(a) 0
...
39 kg m-3

(c)

0
...
18 kg m-3

(e)

386 kg m-3

18
...


19
...
0 kg bag of sugar (molar mass 342) is dissolved in 500 g water
...
51 K molal-1
...
5°C

(c)

103°C

(d)

105°C

(e)
20
...
5°C

118°C

What is the number of molecules in 3
...
48 × 1023

(c)

1
...
00 × 1023

(e)

21
...
02 × 1022

1
...
7156 g sample of a liquid was completely vaporised to produce 189 cm3
of vapour, measured at one atmosphere pressure and 17°C
...


Which one of the following statements is INCORRECT?

(a)
(b)

Repulsive forces determine the size of the molecule

(c)

Liquefaction of a gas occurs because of intermolecular attraction

(d)

A real gas below its critical pressure will not liquefy

(e)
23
...

(d)
(e)

24
...

xA + xB = 1

What mass of ethanol is to be added to 100 g water to prepare a mixture in
which ethanol and water have the same mole fraction?

(a)
(b)

78 g

(c)

100 g

(d)

128 g

(e)

25
...
714 kg m-3

(b)

1
...
429 kg m-3

(d)

1
...
560 kg m-3

26
...
04 and 16
...
What is the mole fraction of toluene in the vapour
above a mixture of these miscible liquids containing 50% by mass of
benzene?
(a)
(b)

0
...
50

(d)

0
...


0
...
75

Which one of the following aqueous solutions has the LOWEST boiling
point elevation?
(a)
(b)

0
...
15 M caesium chloride

(d)

0
...


0
...
10 M aluminium oxide

What is the osmotic pressure exerted by an 0
...
5 x 101 N m-2

(b)

2
...
5 x 103 atmospheres

(d)

2
...
5 x 105 N m-2



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