Loading Assignment

Set TC14: Gibbs Free Energy and Phase Changes

Problem
Points
1
0/1
2
0/1
3
0/4
4
0/1
5
0/1
6
0/1
Total Score
0/9
Percentage
0 %
Assignment Overview

Relate the values of entropy change, enthalpy change, and temperature to the spontaneity of a phase change.  

 1. TC14Q1
Points: 0/1

The following is known about a chemical process: ΔH is > 0 and ΔS is > 0.

From this information, one can safely conclude that _____.

  1. Attempts: 0
 2. TC14Q2
Points: 0/1

The following is known about a chemical process: ΔH is < 0 and ΔS is < 0.

From this information, one can safely conclude that _____.

  1. Attempts: 0
 3. TC14Q3
Points: 0/4

Consider the following phase change: H2O(l) → H2O(g) 

having ∆H and ∆S values of …

∆H = +40.7 kJ

∆S = +109.1 J/K

  1. Calculate the ∆G value at 328 K (55°C) .

    ∆G

    kJ

    Attempts: 0

  2. Calculate the ∆G value at 371 K (98°C).

    ∆G

    kJ

    Attempts: 0

  3. Calculate the ∆G value at 375 K (102°C).

    ∆G

    kJ

    Attempts: 0

  4. At which of these three temperatures is the reaction spontaneous?

    Attempts: 0
 4. TC14Q4
Points: 0/1

Acetone has a ∆Hvaporization of +31.3 kJ/mol and a ∆Svaporization of +95.1 J/mol/K. Based on this data, determine the normal boiling point (in °C) of acetone.

  1. Normal Boiling Point

    °C

    Attempts: 0
 5. TC14Q5
Points: 0/1

A substance has an enthalpy of vaporization of +298.5 kJ/mol and an entropy of vaporization of +914.8 J/K/mol. Calculate the normal boling point (in °C) of the substance.

  1. Normal Boiling Point 

    °C

    Attempts: 0
 6. TC14Q6
Points: 0/1

For mercury, the enthalpy of vaporization is 58.51 kJ/mol and the entropy of vaporization is 92.92 J/K/mol. Based on this data, what is the normal boiling point (in °C) of mercury? 

  1. Normal Boiling Point

    °C

    Attempts: 0

Tired of Ads?
Go ad-free for 1 year