Homework Help: Chemistry

Posted by Cliff on Tuesday, November 23, 2010 at 4:17pm.

Please let me know how I am doing with the following three chemistry questions.

1.A sample of a gas in thermometer has a volume of 135mL at 11 degree celcius.Indicat what temperature(in k and degree celcius)would correspond to the foll.volume:
(a)volume:113mL temperature ??

Solution:Finding final temperature or T2 using Charles'law
T2= V2T1/V1
=(113ML)(11degree celcius/135mL
=9.21degree celcius.

2.If a 5.00L sample of an ideal gas was cooled from 24degree celcius to
-272degree celcius,what will the volume become? Give your answers in sign.figures.

Solution:Applying Charles'law
V2=V1T1/TI
=(5.00)(1kelvin)/297kelvins
= 0.17L

3.A sample of ammonia gas at standard pressure is heated from 20degrees celcius to 200degrees celcius.If the volume remains the same what is the final pressure in mmHg?

Solution:
Finding final pressure or P2,using Gay-Lussac's law
P2=P1T2/T1
=(1atm)(473K)/293K
=1.61atm

Thanks for your work.

Chemistry - DrBob222, Tuesday, November 23, 2010 at 5:24pm
a is not right. T must be substituted in Kelvin (K = 273 + C) for Charles' Law to work properly.

2. I worked the problem and obtained 0.0168 L. You are allowed three significant figures so you shouldn't round to two. I think you slipped a decimal point, too.

3. 1.61 atm looks good to me.

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