Tutorial 2 Pc January 2019.pdf

TUTORIAL : PHYSICAL CHEMISTRY CLB 10703 January Semester 2019 Name : Student ID :

Group :

1.

Define the term “Thermodynamics”. Give some examples of its application.

2.

Differentiate between system and surrounding. Sketch a diagram to show the relationships.

3.

Describe in details about open system, closed system and isolated system. Give examples for each of them.

4.

What is energy? State the units that are commonly used in chemistry.

5.

Differentiate between work and heat in chemistry. State the sign conventions for work and heat and give examples.

1

Universiti Kuala Lumpur | Malaysian Institute of Chemical and Bioengineering Technology

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Tutorial 2

TUTORIAL : PHYSICAL CHEMISTRY CLB 10703 6.

Calculate the work done when a gas is expanded from 250 dm3 to 645 dm3 by an external pressure of 11.5 kPa.

7.

A gas is compressed into 3.5 L container against a constant pressure of 1 atm at 25°C. How much work is done on the gas by the surroundings (in joules)?

8.

Describe the different types of energy.

9.

Discuss in details about these terms; isochoric process, isobaric process, adiabatic process and isothermal process.

2

Universiti Kuala Lumpur | Malaysian Institute of Chemical and Bioengineering Technology

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January Semester 2019

TUTORIAL : PHYSICAL CHEMISTRY CLB 10703 January Semester 2019 10. State the First Law of Thermodynamics. Give the mathematical statement of this law.

11. Define endothermic process and exothermic process.

12. A balloon is heated by adding 1135 J of heat. It expands, doing 538 J of work on the atmosphere. Calculate the change in internal energy of the system.

3

Universiti Kuala Lumpur | Malaysian Institute of Chemical and Bioengineering Technology

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13. A sample of liquid propane weighing 7.15 g was burned in a bomb calorimeter. The observed temperature rise was from 23°C to 29.4°C. Calculate the ΔU for the combustion of 1 mole of liquid propane. (Mr propane = 44.1 g/mol; heat capacity of propane = 16.72 J/K)

TUTORIAL : PHYSICAL CHEMISTRY CLB 10703 January Semester 2019

4

Universiti Kuala Lumpur | Malaysian Institute of Chemical and Bioengineering Technology

[email protected]

14. A vessel containing 2.5 kg of water at 25°C is heated until it boils. Calculate how much heat is supplied to boil the water. (Assume : molar heat capacity of water; Cm = 75.4 J K-1 mol-1)