THE IDEAL GAS EQUATION
(p. 434 – 436 in text book)
P
V = n R T
"P" stands for
__________________, must be in units of __________________
"V" stands for
__________________, must be in units of __________________
"n" stands for
__________________, must be in units of __________________
"T" stands for __________________,
must be in units of __________________
"R" stands for the
Ideal Gas Constant , has a value of 0.0821 with units of L .
atm
mole . K
EXAMPLE 1:
Q: What
pressure is exerted by 0.325 moles of hydrogen gas in a 4.08 L container at 35 oC?
A: P V = n R T solving
for P
...
P = n R T
V
n = 0.325 moles (correct unit), T = 35 oC (need to convert to K), V
= 4.08 L (correct unit)
T = 35 oC + 273 = 308 K
P = (0.325 moles) (0.0821 L atm/mole K) (308 K) = 2.01 atm
(4.08 L)
EXAMPLE 2:
Q: What mass
of chlorine gas, Cl2, in grams, is contained in a 10.0 L tank at 27 oC
and 3.50 atm
of
pressure?
(Answer: 101 grams)
EXAMPLE 3:
Q: A gas at
20.0 oC and 3.98 atm contains 1.45 moles of gas particles.
What volume does
the gas
occupy?
(Answer: 8.77 L)