<p> SCH4C Mole & Avogadro’s Number</p><p>Recall that the mole is a unit that is used to make equations easier to work with. One mole of any substance occupies 22.4 L of space at 101.3 kPa of pressure & a temperature of 273.15 K (0 C). According to Avogadro there are 6.023 x 1023 particles for a mole of any substance. We can use the mole to determine the masses of substances within equations or the number of particles involved. Here are some questions to get started:</p><p>1. What is the number of atoms in 1 mole of Na (s)?</p><p>2. What is the number of atoms in 1 mole of Cl2 (g) ? 3. What is the number of molecules in 1 mole of NaCl? 4. What is the number of atoms in 1 mole of NaCl?</p><p>5. What is the number of atoms in 1 mole of CaCO3? 6. What is the number of molecules in 1 mole of Na2SO4? 7. What is the number of atoms in 1 mole of Na2SO4? 8. How many moles are there of Na if there are 6.02 x 1023 atoms? 23 9. How many moles are there of Cl2 if there are 6.02 x 10 atoms? 23 10. How many moles are there of Na2SO4 if there are 6.02 x 10 atoms? 11. What is the molar mass of H2 (g) ? 12. What is the molar mass of O2 (g) ? 13. What is the molar mass of H2O (l)? 14. What is the molar mass of H2SO4 (aq) ?</p><p>15. What is the molar mass of Na3PO42H2O (s) ? 16. What is the mass of 3.0 moles of salt (NaCl)?</p><p>17. What is the mass of 4.5 moles of C6H12O6? 18. What is the mass of 0.5 moles of sodium phosphate? 19. How many moles of lithium oxide are there in a 29.8 g sample? 20. How many moles of silver nitrate are there in a 339.8 g sample?</p><p>Solutions:</p><p>1. 6.02 x 1023 atoms 2. 1.20 x 1024 atoms 3. 6.02 x 1023 molecules 4. 1.20 x 1024 atoms 5. 3.01 x 1024 atoms 6. 6.02 x 1023 molecules 24 7. 4.21 x 10 atoms 8. 1.0 moles 9. 0.5 moles 10. 0.143 moles (1/7th) 11. 2.0 g/ mol 12. 32.0 g/mol 13. 18.0 g / mol 14. 98.0 g/mol 15. 199.1 g/mol 16. 3.0 moles x 58.5 g/mol = 175.5 grams 17. 4.5 moles x 180.0 g/mol = 810.0 grams 18. 0.5 moles x 164.0 g/mol = 82.0 grams 19. 29.8 grams / 29.8 g/mol = 1.0 moles 20. 339.9 grams / 169.9 g/mol = 2.0 moles</p>