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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: Bjc51192 on March 08, 2011, 07:53:44 PM

Title: A 0.50 mol sample of oxygen gas is confined a 0° C in a cylinder. The initial p
Post by: Bjc51192 on March 08, 2011, 07:53:44 PM

 A 0.50 mol sample of oxygen gas is confined a 0° C in a cylinder. The initial pressure in the cylinder is 1.0 atm. If the gas is compressed by a piston so that the final volume is 62.3% of the initial volume and the final pressure of the gas is 2.15 atm. What is the final temperature of the gas in kelvin? Enter your answer to the nearest degree.

The answer is 366 K

What am I doing wrong here? Here is my game plan

Using V= Nrt/p to find the initial volume

0.50x0.08206x273/1.00 = 11.20l

11.20 x 0.623= 6.9776
11.20 -6.9776 = 4.2224L ------ final volume

Now solve for Final T

pv/nr = T

2.15atm X 4.2224L / 1.00 * 0.08206 = 110.62
 
I have an exam tommorrow so explanation on this problem will be greatly appreciated.
 

Title: Re: A 0.50 mol sample of oxygen gas is confined a 0° C in a cylinder. The initial p
Post by: opti384 on March 08, 2011, 11:00:33 PM

It says that the final pressure is 62.3% of the initial volume not "37.7% of the initial volume."

Quote

2.15atm X 4.2224L / 1.00 * 0.08206 = 110.62

is the mols of gas 1.00?