Comments re Chapter 2 Problems:

2-3

An exercise with units.

2-6

One of Levine's T/F problems.  Please provide reasons for each of your answers.
I am not sure about the answer for part (e) that is given in the answer book.

2-8

A simple problem that requires calculation of the work done when a perfect gas expands at constant pressure.  Conversion of energy units is required.  A good way to convert energy units is to use a ratio of ideal gas constants expressed in different units
e.g., (J/mol-K)/(L-atm/mol-K) = (J/L-atm).

 

 

2-11

This problem in done in General Chemistry but it is worth doing it again.

2-12

Another one of Levine's T/F problems.  Please provide reasons for each of your answers. 
Note/  A cyclic process is a process that ends in exactly the same state as it began.  If a cyclic process is carried out the temperature, pressure, and volume of the system are exactly the same at the end of the process as at the beginning.
Hint/  Be careful about part (e).  Is the amount of water specified?

2-23

Yet another T/F problem.  Please provide reasons for each of your answers.

2-36

The last T/F problem (for this chapter).  Please provide a reason for each of your answers.

2-37

Calculation of q, w, DU, and DH for the isothermal expansion of a perfect gas (a standard problem). Also for expansion into a vacuum (another standard problem).

 

 

2-32

Simple problem based on a Joule-Thomson expansion. The point is to see the magnitude of the effect.  A second point is that a derivative can be approximated as the ratio of two small changes - or even larger changes if the ratio is relatively constant over the range.  The problem asks for the calculation of DT for a given DP for a given value of the Joule-Thomson coefficient.

2-38

A similar problem, but includes an adiabatic expansion (yet another standard problem).

2-44

Another of Levine's conceptual problems, which look simpler than they are.  For part (c) it is necessary to know that in an adiabatic process q = 0.

2-46

Calculation of q, w, DU, and DH for the adiabatic compression of liquid water. (The term adiabatic means no heat transfer so that q=0).  This problem looks (and is) easy but requires understanding that the volume is essentially constant over the pressure range given (10 atm isn't much) and requires working out the molar volume from the density and molar mass.

2-47

First-Law problem in which the temperature-dependence of the heat capacity matters. Since dH = CpdT, the calculation of DH requires (a simple) integration.
This problem, like many others, asks for calculation of q, w, DU, and DH for a process.  Always start by looking for the easiest quantity to calculate, which could be any one of the four.  Then do the second easiest, and save the hardest for last.

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