Here you'll learn all about Stoichiometry. You'll learn how to go from mass to mass, from moles to moles, from volume
to volume, and limiting reagents. You'll also learn about the gas laws: Boyle's Law, Charles' Law, Combined Gas Law, and
the Ideal Gas Law.
They're hard at first, but don't worry! With practice, you can become a pro at stoichiometry and gas laws.