Ethanol has a heat of vaporization of 38.56 kJ/mol and a normal boiling point of 78.4°C. What is the vapor pressure of ethanol at 23°C?

A solid crystallizes into two forms α-solid and β-solid. Using the phase diagram below, determine which solid state is less dense.

Determine what each point (a to g) represents in the phase diagram shown below:

Draw the phase diagram using the following data: 

(a) triple point = 10°C, 0.05 atm

(b) critical point = 225°C, 15 atm

(c) normal melting point = 50°C

(d) normal boiling point = 120°C

(e) Sublimation at 0°C requires 0.005 atm

Identify the correct statement below: 

I. Deposition is represented by line AB

II. Two phase changes occur as the temperature is increased from 10°C to 180°C  at 1 atm

III. The liquid is denser than the solid

IV. The freezing point of the solid increases as pressure is decreased.

V. One phase change occur as the pressure is increased from 0.005 atm to 15 atm at 100°C

a) I, III

b) II, IV

c) III, IV

d) II, V

e) IV, V

Calculate the amount of heat (in kJ) released when 35.0 g of benzene vapor is cooled from 96.0ºC to 26.4ºC. For benzene:

b. p. = 80.09ºC, ΔH_vap = 30.72 kJ/mol

m. p. = 5.49ºC, ΔH_fus = 9.87 kJ/mol

C_{p, liq} = 136.0 J/(mol ºC)

C_{p, vap} = 82.4 J/(mol ºC)

Which statement is correct regarding the heat of vaporization, heat of fusion, heat of sublimation at the same temperature?

Take into consideration a substance that melts at 75 °C and boils at 115 °C. Which of the following graphs best depicts the compound's heating curve between 50 °C and 250 °C?

Identify the type (or types) of crystalline solid that possess the following properties: typically soft, relatively low melting point, and poor electrical conductor.

Consider the substances below that have a liquid crystal state. Which compound will have a solid-to-liquid crystal phase change at a higher temperature and why?

Match the solids PVC (polyvinyl chloride), Ni, CaSO₄, sucrose, and diamond to their correct classifications.

(i) Molecular solid

(ii) Metallic solid

(iii) Covalent network solid

(iv) Amorphous solid

(v) Ionic solid

Consider the two packing patterns below:

Identify the type of two-dimensional lattice.