STOICHIOMETRY Flashcards
Quantity of a substance that contains the same number of ultimate particles in given mass (molar mass)
Mole
What is Avogadro’s Number
6.022 x 10^23
Compounds can be interpreted at two levels
- Molecular
- Atomic
The amount of an element or a compound can be expressed in three ways:
- Mass in grams
- Number of moles
- Number of Particles
Sum of all mass numbers of the atoms that make up the compound composed of molecules and have primarily ionic bonding
Formulas Mass → Metal-Nonmetal
Sum of all mass numbers of the compounds that are composed of molecules and have primarily covalent bonding
Molecular Mass → Nonmetal - Nonmetal
If the moles are given, how to solve for molar mass (g)
no. of moles x molar mass in periodic table
If the moles are given, how to solve for molecules
no. of moles x avogadro’s number
If molar mass(g) is given, how to solve for moles?
no. of molar mass (g) / mass in periodic table
If molar mass(g) is given, how to solve for molecules?
(no. of molar mass / mass in periodic table) x avogadro’s number
if molecules is given, how to solve for moles?
molecules / avogadro’s number
if molecules is given, how to solve for molar mass(g)?
(molecules / avogadro’s number) x mass in periodic table
The percent by mass of each element in a compound
Percent Composition
The sum of all the percent compositions of all the elements found in a given compound shall be equal to 100%
Percent Composition
Shows the elements that are present and the simplest whole-number ratio of their atoms, but not necessarily the actual number of atoms in a given molecule
Empirical Formula
