Transcript IDEAL GAS LAW - Rochester Community Schools

IDEAL GAS LAW
PV=nRT
IDEAL GAS LAW
P=pressure (in kPa or atm
only!)
V= volume in Liters
n = number of moles
R= Ideal Gas Law
Constant
T= Temperature in KELVIN
IDEAL GAS LAW
R= 8.31 kPa*L
Mole*K
Or
R= .0821 atm*L
mole * k
**Units must cancel in what you plug
into the equation!!!
IDEAL GAS LAW
Ideal gases are those that are:
•Not affected by intermolecular
forces
•Behave according to the
Kinetic molecular theory
IDEAL GAS LAW
• Avagadro’s Principle:
Equal volumes of gases at
the same temperature and
pressure contain the same
numbers of particles
1 mole= 22.4 L of gas= 6.023
23
x 10 atoms/molecules
IDEAL GAS LAW
• In reality, no gas is ideal.
• Under the right conditions,
calculations with the ideal
gas law will be very close to
real gases.
IDEAL GAS LAW GRAPH
• Shows how accurately
the ideal gas law can be
used to estimate the
characteristics of a real
gas.
IDEAL GAS LAW GRAPH
IDEAL GAS LAW GRAPH
• The closer the real gas is
to the ideal gas line
(constant), the better the
estimation will be.
IDEAL GAS LAW GRAPH
Examples
1. 3.25 g of XeF4 gas is placed into an
evacuated 5.00 liter container at 80.0 °C.
What is the pressure in the container?
Examples
2. What is the temperature if 1 mole of O2
occupying 100 L of volume has a pressure
of 20 Pa (1000 Pa=1 KPa)?
Examples
3. A 334 mL cylinder for use in chemistry
lectures contains 8.470 g of helium at
23oC. How many grams of helium must
be release to reduce the pressure to
145 atm assuming ideal gas behavior?
(Atomic weight: He = 4.00).