Physics
posted by Kelsey .
(a) An ideal gas occupies a volume of 1.6cm3 at 20°C and atmospheric pressure. Determine the number of molecules of gas in the container.
(b) If the pressure of the 1.6cm3 volume is reduced to 1.6 1011 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.

I would memorize atmospheric pressure as 101.3kPa

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? 
never mind, i got it. thanks so much!