Chemistry 1301A/B Lecture Notes - Lecture 48: Mole Fraction, Limiting Reagent, Stoichiometry

• School: Western University
• Department: Chemistry
• Course: Chemistry 1301A/B
• Professor: Angela White

Document Summary

Atoms, molecules, moles: number of protons = atomic number (z) total number of protons and neutrons = mass number (a, notation. Isotopes: atoms of the same element with the same number of protons but different number of neutrons. Isotopic abundance: percent (by number) of a given isotope relative to all naturally occurring isotopes of that element: average atomic mass = percent isotopic abundance. X isotopic mass: cations: atoms that have lost electrons (+, anions: atoms that have gained electrons (-, avogadro"s number: 6. 02 x 1023. Divide all moles by the smallest mol. Multiple by an integer until all are integers: mole fraction = number of molesof one species total number of moles, mole percent = number of molesof one species total number of moles. X 100: the sum of all mole fractions in a species must be one, average molar mass = x a mm a. Reaction stoichiometry: percent yield = actual yield theoretical yield.