Thermodynamics Assignment Worksheet

 Thermodynamics Assignment Worksheet

Student Assessment Number:

Binary Mixtures

Intermolecular Forces

For each of the types of intermolecular forces listed below use examples to explain how and where they occur.

• Van der Waals forces
• Permanent dipole-permanent dipole interactions
• Hydrogen bonds

[10 marks]

Mixture A: butan-1-ol-butan-2-ol

1. Plot the temperature-composition (butan-2-ol) diagram for mixture A.

[5 marks]

• For a starting composition of z_butan-2-ol = 0.1, identify the phases present, giving the compositions of the components and significant temperatures where appropriate, as the mixture is heated at constant composition from 375 K.

[10 marks]

• Mixture A is distilled with a starting composition of z_butan-2-ol = 0.1. What is the composition of the liquid and vapour after three theoretical plates?

[3 marks]

• Does Mixture A display ideal or non-ideal behaviour?

[2 marks]

• Which intermolecular forces are present in Mixture A and how do they account for the behaviour identified in Q4 and any notable features in the temperature composition diagram?

[10 marks]

Mixture B: Water-formic acid

1. Plot the temperature-composition (water) diagram for Mixture B.

[5 marks]

• For a starting composition of z_water = 0.7, identify the phases present, giving the compositions of the components and significant temperatures where appropriate, as the mixture is heated at constant composition from 373 K.

[10 marks]

• Mixture B is distilled with a starting composition of z_water = 0.7. What is the composition of the liquid and vapour after three theoretical plates?

[3 marks]

• Does Mixture B display ideal or non-ideal behaviour?

[2 marks]

• Which intermolecular forces are present in Mixture B and how do they account for the behaviour identified in Q4 and any notable features in the temperature composition diagram?

[10 marks]

Mixture C: Ethanol-benzene

1. Plot the temperature-composition (benzene) diagram for Mixture C.

[5 marks]

• For a starting composition of z_benzene = 0.1, identify the phases present, giving the compositions of the components and significant temperatures where appropriate, as the mixture is heated at constant composition from 340 K.

[10 marks]

• Mixture C is distilled with a starting composition of z_benzene = 0.1. What is the composition of the liquid and vapour after three theoretical plates?

[3 marks]

• Does Mixture C display ideal or non-ideal behaviour?

[2 marks]

• Which intermolecular forces are present in Mixture C? How do they account for the behaviour identified in Q4 and any notable features in the temperature composition diagram?

[10 marks]

References