Chemistry Unit 2

Formula weight

Definition: the sum of the atomic weights of each atom in its chemical formula.How to Find it: The formula weight can be calculated by using the atomic weights found in the periodic table and the chemical formula of the compound.CaCl2= (1 x 40.08)+(2 x 35.45)=110.98Unit:Atomic weight=amumass=g

Avogadro's number

Number: 6.022 x 1023molDefinition: (constant) used to relate the amount of a substance to a number of particles of that same substance.Unit: molConversion example: 1 mol N / 6.022 x 1023 atoms N

molar mass

Definition: The molar mass of a compound is always numerically equal to its formula weight. Unit: g/mol Conversion example: 1 mol N / 14.01 g N