1. Mole = a fixed amount of substance, n = SI unit, mol = 6.02 x 10 23 How many particles are in 3 moles, 0.5 moles and 0.001 moles? How many moles are 6.02 x 10 24 electrons and 3.01 x 10 21 ions?

2. one mole of a substance

3. Molar ratios If there are 2 x 10 22 C-atoms in a sample of ethane, C 2 H 6, how many hydrogen atoms are there in that same sample? If you have 4.5 x 10 22 atoms of hydrogen in a sample of ammonia, how many molecules of ammonia do you have? How many moles of oxygen are there in 2 moles of Al 2 O 3 ? How many moles of NO 3 - are there in 1 mole of Ga(NO 3 ) 3 ? What is the total number of atoms in 0.05 moles of NH 4 NO 3 ?

4. The mole concept Find the mass of 1 molecule of ethanol, C 2 H 5 OH. Find the number of carbon atoms in 0.1 mole of C 2 H 5 OH. Which sample contains the greatest number of particles? 5g of NH 3 5 g of H 2 O 5 g of CaO?

5. answers Find the mass of 1 molecule of ethanol, C 2 H 5 OH. molar mass  mass of 1 atom/molecule  divide by 6.02 x 10 23 = 46/6.02 x 10 23 = 7.65 x 10- 23 g

6. answers Find the number of carbon atoms in 0.1 mole of C 2 H 5 OH. number  number of  number of of moles molecules atoms  multiply multiply by number by 6.02 x 10 23 of atom in molecule

7. answer Moles NH 3 = 5 g/ 17.04 g = 0.29 Moles of H 2 O = 5g /18.01 g = 0.28 Moles CaO = 5g / 56.08 g = 0.09