# Chemistry Quiz On Temperature And Pressure!

10 Questions  Settings  This Chemistry quiz has been created to test your knowledge about the temperature, volume, pressure and effects. There are 10 tough questions with graphs and pictures to make you understand about the temperature and pressure. Read the questions carefully and answer. If your answer is correct, then feedback will be displayed. So, let's try out the quiz. All the best!

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• 1.
A hydrogenation reaction is conducted in a solvent of hexadecane. The desired molar concentration of hydrogen in the liquid is 0.1 mol/kg_soln⋅ . The Henry's Law coefficient for hydrogen in hexadecane at the reaction temperature is 0.068⋅mol_H2/kg_soln⋅MPa. The hydrogen partial pressure needed for the reactor is most nearly (psi):
• A.

23

• B.

213

• C.

57

• D.

1.0

• 2.
A refrigeration unit using refrigerant R-134a rejects heat at 40 C and absorbs heat at -40 C. Assuming the following:
• the expansion valve operates isenthalpically
• • the refrigerant leaving the evaporator coil is saturated vapor
• • the refrigerant leaving the condenser is saturated liquid.
Using the diagram below, the circulation rate (lb/min) of the refrigerant required for a 4 ton cooling system is most nearly:
• A.

900

• B.

12

• C.

8

• D.

15

• 3.
A 5 ton refrigeration unit has a coefficient of performance of 2.0. The theoretical power requirement for the compressor (kW) is most nearly:
• A.

30

• B.

90

• C.

8.8

• D.

6.4

• 4.
A liquid mixture consists of 90-mole per cent of compound "A" and 10% of compound "B". Their pure vapour pressures are 0.5 psia and 1.2 psia at the mixture temperature, respectively. Assuming the Lewis-Randall Rule is valid for compound "A", the fugacity of "A" (psi) is most nearly:
• A.

0.05

• B.

0.20

• C.

0.45

• D.

1.01

• 5.
The vapor pressure of H2S at several temperatures is provided in the table below.   The latent heat of vaporization (kJ/mol) of H2S at 200 K is most nearly:
• A.

19

• B.

-38

• C.

-20

• D.

2.1

• 6.
A liquid contains 12 mole percent CS2. The fugacity of CS2 for the mixture is 0.013 atm. Assuming a standard state fugacity of 1 atm, the liquid activity coefficient of CS2 is most nearly:
• A.

1.2

• B.

0.52

• C.

0.01

• D.

0.11

• 7.
The equilibrium vapor phase of a mixture of ammonia and water contains 10 mole percent water. The system is at 350 K and 3 atm. If the fugacity of water for this system is 0.289 atm, the vapor phase fugacity coefficient for water is most nearly:
• A.

0.88

• B.

0.96

• C.

0.99

• D.

1.02

• 8.
Liquid water and liquid benzene are immiscible. A vapour mixture at 1.5 atm is cooled to a dew point temperature of 50 C. The liquid formed at this dewpoint consists of benzene. The mole fraction of water in the original vapour mixture is most nearly:
• A.

0.76

• B.

0.36

• C.

0.57

• D.

0.24

• 9.
The vapor-liquid phase envelope for a system is provided below. The bubble point pressure of the system at 550 K is most nearly (atm):
• A.

250

• B.

200

• C.

115

• D.

50

• 10.
Isobutanol and benzene form an azeotrope at 1 atm and 79.84 C. The azeotrope contains 10 mole percent of isobutanol. Given the vapor pressure functions below, the activity coefficient for isobutanol at the azeotrope composition is most nearly:
• A.

0.32

• B.

1.6

• C.

0.61

• D.

3.1