Volume of Gas At Standard Condition ? Which Gas Law ?

AI Thread Summary
To find the volume of a gas sample at standard conditions, the ideal gas law (PV=nRT) is applied. The initial conditions are 250 mL at 37°C and 730 torr, which converts to 0.250 L, 310 K, and 0.960 atm. Standard conditions are defined as 273 K and 1 atm, with a molar volume of 22.4 L. The calculations suggest that the volume at standard conditions is approximately 0.290 L, but confusion arises regarding the application of the formula, as the expected behavior of gas volume under changing temperature and pressure is not aligned with the result. The correct approach involves using the relationship PV/T = constant to ensure accurate results.
benworld
Messages
7
Reaction score
0

Homework Statement



A Sample of gas 250 mL at 37 C and 730 torr . What volume would gas occupy at standard conditions ?

Homework Equations



pv = nRT

V2 = T2P1V1
-------
T1P2


The Attempt at a Solution



Sample Gas

V = 250 mL ( 0.250 L )
P = 730 torr ( .960 atm )
T = 310 K

Standard Condition

T = 273
V = 22.4 L
P = 1 atm

I'm confused because sample gas formula is already given and then find the gas under stand condition ?

Do I just use standard condition formula and drop the other ones ?


If I use pv = nRT then I get following

v = (0.250 L / 22.4 L = .0111 mol) since STP 1 mol = 22.4 L
p = .960 atm
R = 0.08260 ( constant gas )
T = 310 K

v = (.0111 mol ) (0.08260)(310)
--------------------------
.960 atm

Answer = .290 L

The answer doesn't seem to make sense. Any correction ?
 
Physics news on Phys.org
I think you are only supposed to use the temperature and pressure at STP and use the equation

PV/T = PV/T
 
Good that you see that answer doesn't make sense. You are lowering temperature and increasing pressure, volume can't go up.

--
methods
 
I got the answer..211 mL.. user p1v1/t2 = p2v2/t2

close this thread.
 
I don't get how to argue it. i can prove: evolution is the ability to adapt, whether it's progression or regression from some point of view, so if evolution is not constant then animal generations couldn`t stay alive for a big amount of time because when climate is changing this generations die. but they dont. so evolution is constant. but its not an argument, right? how to fing arguments when i only prove it.. analytically, i guess it called that (this is indirectly related to biology, im...
Back
Top