Moles, Stoich, and Limiting Reactant Study Deck

atomic mass unit (amu)

the mass of one proton or neutron is equal to one unit (one twelfth the mass of a carbon-12 atom)

average atomic mass

the weighted average of the atomic masses of the naturally occurring isotopes of an element

mole

the SI base unit used to measure the amount of a substance whose number of particles is the same as the number of atoms of carbon in exactly 12 g of carbon-12, one mole is the amount of pure substance that contains 6.02 x 10^23 representative particles.

molar mass

the mass in grams of one mole of any pure substance

reactant

a starting substance in a chemical reaction

product

a substance formed during a chemical reaction

limiting reactant

a reactant that is totally consumed durign a chemical reaction, limits the extent of the reaction and determines the amount of product

excess reactant

a reactant that remains after a chemical reaction stops