1. Chemistry 10.2 Mole – Mass / Mole – Volume Relationships

2. I. Molar Mass A. Def – is the mass in grams of one mole of a substance. B. Combine molar mass + moles 1. Ex: How many grams are in 9.45 mol of dinitrogen trioxide? 9.45 mol N 2 O 3 x 76.0 g N 2 O 3 1.00 mol N 2 O 3 = 718 g N 2 O 3

3. 2. Ex: Find the number of moles in 92.2 g of iron (III) oxide. 92.2 g Fe 2 O 3 x 1.00 mol Fe 2 O 3 159.6 g Fe 2 O 3 =.578 mol Fe 2 O 3

4. C. In Class Problems 1. How many grams are in.673 mol of C 6 H 12 O 6 ? 2. How many mol are in 12.6 g of FeO? 3. How many grams are in 18.2 mol of Al(OH) 3 ? 4. How many mol are in 123.5 g of (NH 4 ) 2 CO 3 ? 5. How many grams are in.875 mol of dicarbon tetrafluoride?

5. 6. How many mol are in 456.3 g of barium sulfate? 7. How many grams are in 3.56 mol of silver nitrate? 8. How many mol are in 222.2 g of Iron(III) oxide? 9. How many grams are in 4.05 x 10-3 mol of octacarbon decahydride?

6. II. The volume of a Mole of Gas A. Very Predictable 1. any gas… 1 mol = 22.4 liters B. Gases vary with temperature and pressure. C. STP 1. Standard Temperature and Pressure -0 deg. Celsius -1 Atmosphere

7. D. Ex: Determine the volume of.600 mol of SO 2 (g) at STP..600 mol of SO 2 x 22.4 L SO 2 1 mol of SO 2 =13.4 L SO 2

8. E. The density of a gaseous compound containing carbon and oxygen is 1.97 g/L at STP. Determine the molar mass of the compound. 1.97 g x 1 Liter = 44.1 g/mol 22.4 L 1 mol