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4.3- Molar Volume of Gases

4.3- Molar Volume of Gases. Mole. measurement of the number of particles in a sample 1 mol He (g) = 6.02 x 10 23 atoms 1 mol CO 2(g) = 6.02 x 10 23 molecules. Molar Volume . the volume of one mole of a gas at specified temperature and pressure SATP = 24.8 L/mol STP = 22.4 L/mol.

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4.3- Molar Volume of Gases

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  1. 4.3- Molar Volume of Gases

  2. Mole • measurement of the number of particles in a sample • 1 mol He (g) = 6.02 x 1023 atoms • 1 mol CO2(g) = 6.02 x 1023 molecules

  3. Molar Volume • the volume of one mole of a gas at specified temperature and pressure • SATP = 24.8 L/mol • STP = 22.4 L/mol

  4. Molar Volume Calculation • use the formula:

  5. Molar Volume Calculation • use the formula: V=v/n

  6. Molar Volume Calculation • use the formula: Molar Volume (L/mol) V=v/n

  7. Molar Volume Calculation • use the formula: V=v/n Molar Volume (L/mol) Volume (L)

  8. Molar Volume Calculation • use the formula: V=v/n # of moles (mol) Molar Volume (L/mol) Volume (L)

  9. Molar Volume Question What volume is occupied by 0.024 mol of carbon dioxide gas at SATP?

  10. Assignment • page 169-171 • Do Everything

  11. Molar Mass (M) • the mass of one mole of a sample • measured in grams per mole (g/mol) • the identity of the substance DOES matter

  12. Calculating Molar Mass (M) • write the correct formula • determine the number of each type of atom • multiply the number of each type of atom by the atomic mass • add up the products

  13. Example • Calculate the molar mass of Ca(NO3)2(s) • M = 1 Ca + 2 N + 6 O • = (1•40.08) + (2•14.01) + (6•16.00) • = 164.10 g/mol

  14. Mass - Mole Conversions • use the molar mass of a substance to convert between mass and moles • use the formula: n=m M

  15. Mass - Mole Conversions • use the molar mass of a substance to convert between mass and moles • use the formula: n=m M # of moles (mol)

  16. Mass - Mole Conversions • use the molar mass of a substance to convert between mass and moles • use the formula: n=m M mass (g) # of moles (mol)

  17. Mass - Mole Conversions • use the molar mass of a substance to convert between mass and moles • use the formula: mass (g) n=m M # of moles (mol) molar mass (g/mol)

  18. Example • Calculate the mass of 2.3 moles of Ca(NO3)2(s) • M = 1 Ca + 2 N + 6 O • = (1•40.08) + (2•14.01) + (6•16.00) • = 164.10 g/mol

  19. Example • n = m/M • m= nM • m= 2.3 moles x 164.10 g/mol • m= 377.4 g

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