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9 Cards in this Set

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the SI base unit used to measure the amount of a substance
- the number of representative particles, carbon atoms, in exactly 12 g of pure carbon-12

*6.02 X 10^23
representative particle
any kind of particle
- atoms
- molecules
- formula units
- electrons
- ions
avogadro's number
6.02 X 10^23
molar mass
the mass in grams of one mole of any pure substance

unit: g/mol

numerically equal to an elements atomic mass

the masses of all elements are established as relative to the mass of carbon-12
i.e. 1 mole hydrogen-1 is 1/12 the mass of 1 mole carbon-12
subscripts in the chemical formula of a compound
tell you the number of atoms of each element present in one molecule of the compound
percent composition
(mass of elemment / mass of compound) X 100
= percent by mass
the study of quantitative relationships between amounts of reactants used and products formed by a chemical reaction

based on the law of conservation of mass (mass of reactants = mass of products)
mole ratio
the ratio between the numbers of moles of any 2 substances in a balanced equation

- determined using coefficients

- each substance in a balanced chemical equation can be the numerator in a mole ratio with the remaining substances in the reaction
moles of unknown
= moles of known X (moles of unknown/moles of known)

mole ratios are used as conversion factors to convert a known number of moles of one substance to moles of another substance in the same chemical reaction