 # Molar Conversions molar mass 6 02 1023 MASS

• Slides: 16  Molar Conversions molar mass 6. 02 1023 MASS NUMBER MOLES IN GRAMS OF PARTICLES (g/mol) (particles/mol) EXAMPLE: GRAMS TO MOLES • How many moles of carbon are in 26 g of carbon? 26 g C 1 mol C 12. 01 g C = 2. 16 mol C SOLVE: GRAMS TO MOLES • How many moles of phosphorus are in 84 g of phosphorus? 84 g P = ___ mol P EXAMPLE: MOLES TO GRAMS • How many grams of carbon are in 2. 2 moles of carbon? 2. 2 mol C 12. 01 g C 1 mole C = 26. 42 g C SOLVE: MOLES TO GRAMS • How many grams of water (H 2 O) are in 4. 2 moles of water? 4. 2 mol H 2 O = _____ g H 2 O HINT! 1 mol of H 2 O = molar mass of H 2 O EXAMPLE: MOLES TO MOLECULES • How many molecules are in 2. 50 moles of C 12 H 22 O 11? 6. 02 1023 2. 50 molecules = 1. 51 1024 molecules 1 mol C 12 H 22 O 11 SOLVE: MOLES TO MOLECULES • How many molecules are in 3 moles of CO 2? 3 mol CO 2 = molecules CO 2 EXAMPLE: MOLECULES TO MOLES • How many moles are in 4. 22 x 1027 molecules of Mg. O? 4. 22 x 1027 molecules of Mg. O 1 mol 6. 02 1023 Molecules of Mg. O = 7010 moles of Mg. O SOLVE: MOLECULES TO MOLES • How many moles are in 1. 2 x 1028 molecules of C 12 H 22 O 11? 1. 2 x 1028 molecules of C 12 H 22 O 11 = moles C 12 H 22 O 11 EXAMPLE: PARTICLES TO MASS • Find the mass of 2. 1 1024 molecules of Na. HCO 3. 2. 1 1024 molecules 1 mol 84. 01 g 6. 02 1023 1 molecules = 290 g Na. HCO 3 SOLVE: PARTICLES TO MASS • Find the mass of 5. 22 x 1024 molecules of Zinc. 5. 22 1024 molecules = g Zn EXAMPLE: MASS TO PARTICLES • Find the number of particles present with 3. 6 g of K. 3. 6 g. K 1 mol 39 6. 02 1023 Atoms K 1 mol g. K = 5. 5 x 10 22 atoms K SOLVE: MASS TO PARTICLES • Find the number of particles present with 50 g of Na. Br. 50 g Na. Br = atoms Na. Br EXAMPLE: MASS TO ATOMS • Find the number of oxygen atoms present in 16. 5 g of O 2. 16. 5 g O 2 6. 02 1023 Molecules O 2 1 mol 32 1 mol g O 2 2 atoms 1 molecule of O 2 = 6. 2 x 10 23 atoms O 2 EXAMPLE: MASS TO ATOMS Find the number of oxygen atoms present in 355 g of Na. NO 3. 355 g Na. NO 3 = # of O atoms