(a) An ideal gas occupies a volume of 1.8 cm3 at 20°C and atmospheric pressure.

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(a) An ideal gas occupies a volume of 1.8 cm3 at 20°C and atmospheric pressure. Determine the number of molecules of gas in the container. 

 molecules 

(b) If the pressure of the 1.8-cm3 volume is reduced to 2.4 ✕ 10−11 Pa (an extremely good vacuum) while the temperature remains constant, how many moles of gas remain in the container? 
 mol
Jun 19th, 2015

Thank you for the opportunity to help you with your question!

for (a) you use the ideal gas law PV=nRT=NRT/Na where N is the number of molecules

so N=PVNa/(RT)

1 atm = 101,325 Pa , V = 1.8 cm3 = 1.8*10^(-6) m3 , T=293 K

N=4.51*10^19

for (b) using the same formula, we get N=1.07*10^4

Hope it helps

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 19th, 2015

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Jun 19th, 2015
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Jun 19th, 2015
Sep 21st, 2017
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