Unit 8 Vocab

1. mole - 6.02 x 10^23 representative particles of a substance and the SI unit for measuring the amount of a substance 
2. Avogadro's number - the number of representative particles in a mole, 6.02 x 10^23
3. representative particle - the species present in a substance (usually atoms, molecules, or formula units) 
4. molar mass - the mass of a mole of an element
5. Avogadro's hypothesis - equal volumes of gases at the same temperature and pressure contain equal numbers of particles
6. Standard temperature and pressure (STP) - a temperature of 0 degrees C and a pressure of 101.3 kPa, or 1 atmosphere (atm)
7. molar volume - the quantity, 22.4 L of a gas
8. percent composition - expresses the relative amounts of the elements in a compound with the percent by mass of each element in the compound
9. empirical formula - the basic ratio, which gives the lowest whole-number ratio of the atoms of the elements in a compound

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