The number of moles of oxygen ($O_2$) gas in a vessel of volume 1 L at STP (273.15 K, 1.013 × 10⁵ Pa) is approximately:
A~ 0.045 mol
B~ 0.045 g
C~ 1.0 mol
D~ 22.4 mol
Answer & Solution
Correct answer: A. ~ 0.045 mol
$n = PV/(RT) = (1.013\times10^5)(10^{-3})/(8.314\times273.15) = 101.3/2270.6 \approx 0.0446$ mol. Equivalently, 22.4 L = 1 mol at STP, so 1 L ≈ 1/22.4 = 0.0446 mol.
Related questions
Molecules in a gas move at speeds of the order of the speed of:Compared with solids, atoms in gases are much:The mean free path in gases is of the order of:Argon is an example of which kind of gas?A gas like argon has which kind of degrees of freedom only?Motion of a body as a whole from one point to another is called:A molecule confined to a plane has how many degrees of freedom?A molecule free to move in space needs how many coordinates?