Module Question

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Amit Kumar 4H
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Joined: Fri Sep 26, 2014 2:02 pm

Module Question

Postby Amit Kumar 4H » Fri Nov 28, 2014 8:47 pm

I have no idea how to do this one. Any help would be appreciated.

Using the ideal gas law, PV = nRT, as an approximation for a real gas, write an expression showing how to convert the concentration of a gas to a pressure value.
A. P = nRT/V
B. V = nRT/P
C. P/n = RT/V
D. P/R = nT/V
E. None of the Above

Posts: 16
Joined: Fri Sep 26, 2014 2:02 pm

Re: Module Question

Postby GinaYoung1L » Fri Nov 28, 2014 10:27 pm

The answer is most likely P = nRT/V because:

1) The question is asking for the pressure value, so P must be isolated on the lefthand side.

2) n/V indicates the moles per liter which is the concentration of the gas. Its value would be provided.

3) R is the gas constant, which is always given.

4) T is the temperature of the gas, which you can also assume to be given.

5) Using all these given values, you can find the unknown, P. However, we are just setting up the equation right now without actually solving for it.

Johnny Dang 1I
Posts: 12
Joined: Fri Sep 26, 2014 2:02 pm

Re: Module Question

Postby Johnny Dang 1I » Sat Nov 29, 2014 12:14 am

This solution can be generalized to other variable within the equation as well. For example, if we were looking for a volume value instead of a pressure value, we would isolate V instead.

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