Question

How many moles of O2 are in 53 L of O2 at STP?

A) 2.4
B) 0.45
C) 1.65
D) 1187

Answer 1

For Any gas:
P V = n R T
where:
P : pressure
V : volume
n : number of moles
R : gas constant
T : absolute temperature in kelvin
provided that:
V = 53 L
S.T.P means standard temperature and pressure at which pressure is 1 atm and temperature is 273 K
R = 0.08205 atm.L /mol.K
So:
n =
`(P.V)/(R.T)` =
`(1atm * 53 L)/(0.08205 * 273 K)`
= 2.4 moles
The correct answer is A) 2.4