Ideal Gas Law
Some
of the easiest marks to earn are ones that relate to the ideal gas
law ... a relationship between pressure, volume, temperature, and the
number of moles of substance that are in the container:
Where
R is the gas constant. The gas constant has dozens of different
values, depending on the units you use. I always use Litres for
volume and atm for pressure, so I always use
It
will be useful to rearrange the ideal gas law to solve for whatever
is unknown in your question. You may be comfortable doing this
algebraically, but here is the same equation written to solve for
each of the variables:
Sample Question 1
Q:
5 mol of an ideal gas are sealed in a 20 L container at 298 K. What
is the pressure inside the chamber?
A: Use the ideal gas law to solve for P.
A: Use the ideal gas law to solve for P.
Sample Question 2
Q:
You react two chemicals together in a lab, and collect the gas that
is created. This gas exerts 2.12 atm of pressure in a 1 L chamber at
298 K. How many moles of gas were created by the reaction?
A: Use the ideal gas law to solve for n.
A: Use the ideal gas law to solve for n.
