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chemistry vocab ch. 10

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mole
the amount of a substance that contains 6.02 X 10 ^23 representattive particles of that substance
Avogadro's Number
the number of representative particles contained in one mole of a substance
representative particle
the smallest unit into which a substance can be broken down without a change in compostition, usually atoms, moleules or atoms
molar mass
a term used to refer to the mass of a mole of any substance
Avogadro's Hypothesis
equal volumes of gases at the same temperature and pressure contain equal numbers of particles
standard temperature and pressure
the conditions under which the volume of a gas is usually measured
molar volume
the volume occupied by 1 mole of a gas at standard temperature and pressure
percent composition
the percent by mass of each element in a copund
empirical formula
a formula with the lowest whole -number ratio of elements ina compound