Chapter 17, Problem 13RQ

You want to create a graph showing the relationship of an ideal gas between pressure (P) and temperature (T). Allow the initial temperature to be 270 kelvin. The range of temperatures to be modeled ranges from 270 to 480 kelvin. Control the scale of the abscissa so the range is shown from 250 to 500 kelvin.

Model two gases:

• Nitrogen (formula, N₂; molecular weight, 28 grams per mole), using a 12-liter tank with an initial pressure of 2.5 atmospheres.
• Oxygen (formula, O₂; molecular weight, 32 grams per mole), using a 15-liter tank with an initial pressure of 4 atmospheres.

After drawing the graph for nitrogen and oxygen, model a third gas, with information entered by the user. Assume the volume is 12 liters.

Ask the user to enter the name of the gas [Example: Chlorine]

Ask the user to enter the initial pressure in the tank measured at 270 kelvin [Example: 3 atm]

Ask the user to enter the temperature of interest [Example: 400 kelvin]. The user is interested in a temperature in the range of 270 to 480 kelvin.

Output the following information to the Command Window:

At a temperature of TTT kelvin for GGG, the pressure is P.P atm.

where:

• TTT is the temperature of interest entered by the user;
• GGG is the name of the gas; and
• P.P is the pressure at that temperature shown to one decimal place.

Add the user-entered gas to the graph, showing the pressure over the range of temperatures from 270 to 480 kelvin. In addition to the single graph with three data series, create an additional figure window with a set of subplots showing each data series as an individual subplot.

Your output should be similar to the following:

In the Command Window:

Enter the name of the gas: Chlorine

Enter the initial pressure [atm] : 3

Enter the temp of interest [K]: 400

At a temperature of 400 kelvin, chlorine has a pressure of 4.4 atm.

The figures should appear similar to the following. The colors and line types may vary.