Posted by **Kelsey** on Sunday, April 25, 2010 at 8:37pm.

(a) An ideal gas occupies a volume of 1.6-cm3 at 20°C and atmospheric pressure. Determine the number of molecules of gas in the container.

(b) If the pressure of the 1.6-cm3 volume is reduced to 1.6 10-11 Pa (an extremely good vacuum) while the temperature remains constant, how many moles of gas remain in the container?

ok, i took the equation PV = nRT

where

P = atmospheric pressure which i believe is 1.5 x 10 ^5

V = 1.6 x 10 ^-6 m^3

R = 8.31

and T = 293

and then i mulitiplied the answer i got times 6.02 x 23 to convert to molecules....but it's not right.

- Physics -
**bobpursley**, Sunday, April 25, 2010 at 8:56pm
I would memorize atmospheric pressure as 101.3kPa

- Physics -
**Kelsey**, Sunday, April 25, 2010 at 8:59pm
so i did that and I got 4.0 X 10 ^16

and it's still wrong...am I just missing a conversion somewhere or something like that?

- Physics -
**Kelsey**, Sunday, April 25, 2010 at 9:04pm
never mind, i got it. thanks so much!

## Answer this Question

## Related Questions

- Intro to Physics - (a) An ideal gas occupies a volume of 3.0 cm3 at 20°C and ...
- physics/chemistry - (a) An ideal gas occupies a volume of 1.0 cm3 at 20°C and ...
- CHEMISTRY!! D: - 1. A sample of gas under a pressure of 622 kPa has a volume of...
- Chemistry;HELP - 1. A sample of gas under a pressure of 622 kPa has a volume of...
- Chemistry;HELP - 1. What volume will a sample of hydrogen occupy at 128.0 oC if...
- Physics - A container of volume 19.4 cm3 is initially filled with air. The ...
- physics - A container of volume 14.2 cm3 is initially filled with air. The ...
- physics- vry urgent - An ideal monatomic gas initially has a temperature of 333 ...
- physics - An ideal monatomic gas initially has a temperature of 338 K and a ...
- physics - An ideal monatomic gas initially has a temperature of 338 K and a ...

More Related Questions