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Question 1

Calculate the work done on the system when 1.00 mol of gas held behind a piston expands irreversibly from a volume of 1.00 dm³ to a volume of 10.0 dm³ against an external pressure of 1.00 bar.

a) -5710 J

b) -900 J

c) +1000 J

d) +9120 J

Question 2

1.00 mol of gas in a cylinder is compressed reversibly by increasing the pressure from 1.00 bar to 10.0 bar at a constant temperature of 500 K. Calculate the work done on the gas by the compression.

a) +9570 J

b) +3740 J

c) +37.4 kJ

d) +5710 J

Question 3

The temperature of a copper block of mass 423g rises by 10.1°C. Calculate the heat transferred, given that the specific heat capacity of copper is 385 J K^-1 kg^-1.

a) 385 J

b) 1.63 kJ

c) 1.10 kJ

d) 25.6 kJ

Question 4

Raising the temperature of 1.00 dm³ of water from a temperature of 25°C to 100°C at constant pressure requires 312 kJ of heat. Calculate the molar heat capacity of water at constant pressure.

a) 4.16 J K^-1mol^-1

b) 5.62 J K^-1mol^-1

c) 75 J K^-1mol^-1

d) 422 J K^-1mol^-1

Question 5

A calorimeter was calibrated by passing an electrical current through a heater and measuring the rise in temperature that resulted. When a current of 113 mA from a 24.1V source was passed through the heater for 254 s, the temperature of the calorimeter rose by 2.61°C. Determine the heat capacity of the calorimeter.

a) 1.04 J K^-1

b) 4.42 J K^-1

c) 692 J K^-1

d) 265 J K^-1

Question 6

A perfect gas expands reversibly at a constant temperature of 298 K so that its volume doubles. What is the change in the molar internal energy of the gas?

a) +2.27 kJ mol^-1

b) 0 J mol^-1

c) +1.72 kJ mol^-1

d) -2.27 kJ mol^-1

Question 7

Which of the following statements is always true for a reaction in which there is no non-expansion work?

a) ΔU = q_p

b) ΔH = q_p

c) ΔU = 0

d) ΔH = 0

Question 8

Calculate the difference between the molar internal energy and the molar enthalpy for a perfect gas at 298.15 K.

a) 35.859 J mol^-1

b) 0 J mol^-1

c) 2.4790 kJ mol^-1

d) 8.3145 J mol^-1

Question 9

For many substances, the variation with temperature of the molar heat capacity at constant pressure of is given by the expression

For copper, a = 22.64 J K^-1 mol^-1, b = 6.28 × 10^-3 J K^-2 mol^-1 with the value of c being negligible. Estimate the change in the molar enthalpy of copper when it is heated from 293 to 323 K.

a) +29.7 kJ mol^-1

b) +1.23 kJ mol^-1

c) +737 kJ mol^-1

d) +1.13 kJ mol^-1

Question 10

The molar heat capacity at constant volume of argon, Ar, is 12.47 J K mol^-1. What is the value of the molar heat capacity at constant pressure?

a) 4.15 J K^-1 mol^-1

b) 8.31 J K^-1 mol^-1

c) 12.47 J K^-1 mol^-1

d) 20.78 J K^-1 mol^-1

Oxford University Press, Online Resource Centre, Chapter 02.

Chapter 02

Instructions