THE MOLE..learning discussion.pptx for grade 9

mole concepts

1. THE MOLE CONCEPT

2. Mole (mol) – is the defined as the amount of particles in any substance (whether an atom, ion, molecule and formula unit) Ex. a.If 1 mole of C atom = 12.00 grams (its atomic mass PT), therefore, 1 mole of Mg atom = 24.31 grams (its atomic mass in PT).

3. B. If 1 mole of H 2 O= 18 grams ( sum of the atomic masses of the atoms present in H20 ), therefore , 1 mole of CO2= 44 grams ( sum of the atomic masses of the atoms present in CO2) 1 mole of NaCl is equal to how many grams of NaCl?

4. 2. Avogadro’s Number – is the number of particles in one mole of a substance, which is equal to 6.02 x 1023 particles (whether an atom, ion, molecule and formula unit. Ex. a.If 1 mole of C = Avogadro’s Number = 6.02 x1023 C atom, therefore, 1 mole of Mg = Avogadro’s Number = 6.02 x1023 Mg atom

5. b.If 1 mole of H2O = Avogadro’s Number = 6.02 x1023 H2O molecule, therefore, 1 mole of CO2= 6.02 x10 23 CO2 molecule How many molecules of NaCl present in 1 mole of NaCl? * And therefore, the process is the same for ions and formula units