(a) An ideal gas occupies a volume of 1.0 cm3 at 20°C and atmospheric pressure. Determine the number of molecules of gas in the container.
i got that right to be 2.5e19 molecules
(b) If the pressure of the 1.0 cm3 volume is reduced to 1.0 1011 Pa (an extremely good vacuum) while the temperature remains constant, how many moles of gas remain in the container?
im not sure how to do this part. and i keep getting it wrong. can you please help me?
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1 answer

Atmospheric pressure is 1.015*10^5 Pa
A decrease in pressure to 10^11 Pa is a factor of 10^16 reduction.
At the same temperature, the number of moles and molecules present in the fixed volume must decrease by a factor of 10^16.
The number of moles in part A is the number of molecules divided by Avogadro's number. 👍
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