Stoichiometry Flashcards
the calculation in chemistry
stoichiometry
the top most number
atomic mass
mass of a single atom of an element
atomic mass
atomic mass is determined by the number of ________________ in its nucleus
protons and neutrons
unit of atomic mass
atomic mass unit (amu)
weighted are mass of all the naturally occurring isotopes of an element
average atomic mass
the atoms of all the same element with different numbers of neutrons, which gives them different masses
isotopes
takes into the account the abundance of each isotope
average atomic mass
how to calculate average atomic mass
- multiply the mass of each isotope in its abundance (as a decimal)
- add these values
ratio of the average atomic mass of an atom to one atomic mass unit
relative atomic mass
it has no unit
relative atomic mass
the number of particles in one mole of a substance
Avogrado’s Number
the amount of a substance that contains (6.022x10^23) particles
mole
can be atoms, ions, molecules, or electrons depending on the context
Avogrado’s Number
1 mole of an element, molecular compound, or ionic compound contains (6.022x10^23)
Avogrado’s Number
mass in grams of one mole of a substance
molar mass
The particular unit used to quantify atoms, molecules, and ions is called the ____________, the Sl unit for the amount of substance.
mole
is dimensionless since the units of masses (amu) get cancelled.
relative atomic mass
the _________ is defined as the amount of substance containing the same number of particles as there are atoms in exactly 12 g of carbon-12 isotope
SI system, the mole (mol)
One mole of a substance is equivalent to the Avogadro’s number, 6.02 × 1023, This number is named in honor of the Italian scientist, ____________
Amadeo Avogadro.
_____________ of a compound (molecular or ionic) is the mass in grams of one mole of a substance.
molar mass
It is numerically equal to the sum of the masses of the elements (in amu) that make up the compound.
molar mass
obtained by multiplying the number of atoms by the atomic mass of each element, and getting the sum.
molar mass
used for compounds that exist as ions (e.g., NaCl). It is expressed in amu or u, and is numerically equal to the molar mass expressed in grams per mole of a substance.
formula mass
is used for compounds that exist as molecules
Molecular mass
___________________ are important to enable conversions between mass and moles of atoms or molecules/ions and vice versa.
The Avogadro’s number and molar mass
