Help chem. question
Moderators: Xen, expert, ChenBeier
-
kellykells
- Newbie
- Posts: 1
- Joined: Mon May 05, 2008 7:39 pm
Help chem. question
Calculate the density in grams per Liters (g?L) of O2 gas at 25.0 degrees celcius and 735 torr? I think I am looking into this too much. Wouldn't you just take the mass divided by the volume?
Yeah density would be mass divided by volume in ur case (in gms per litre ur case)
use PV= nRT
where n is number of moles which is equal to (mass m/molar mass M)
so you have
PV= (m/M)RT
Rearranging you would get
PM= (m/V)RT
m/V is density (d)
so you can write
PM= dRT
or again rearranging
d= PM/RT
now you have everything given
P = 735/760 atm
M= 32 gm/mol
R=0.08206 L·atm·K-1·mol-1 (Gas constant according to the units of ur problem)
T= 298.15 K
Hope that helps,
solve it you will get the answer
use PV= nRT
where n is number of moles which is equal to (mass m/molar mass M)
so you have
PV= (m/M)RT
Rearranging you would get
PM= (m/V)RT
m/V is density (d)
so you can write
PM= dRT
or again rearranging
d= PM/RT
now you have everything given
P = 735/760 atm
M= 32 gm/mol
R=0.08206 L·atm·K-1·mol-1 (Gas constant according to the units of ur problem)
T= 298.15 K
Hope that helps,
solve it you will get the answer
-Sharan