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Formula Mass of Compounds

Formula Mass of Compounds. Molar mass of an element. Molar mass = mass in grams of 1 mole of any pure substance. Molar mass of an element numerically equal to atomic mass but units change to grams per mole. Molar mass of elements.

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Formula Mass of Compounds

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  1. Formula Mass of Compounds

  2. Molar mass of an element • Molar mass = mass in grams of 1 mole of any pure substance. • Molar mass of an element numerically equal to atomic mass but units change to grams per mole.

  3. Molar mass of elements • Na has an atomic mass of 22.990 amu so its molar mass = 22.990 grams • K has an atomic mass of 39.098 amu so its molar mass = 39.098 grams. • Ca has an atomic mass of 40.078 amu so its molar mass = 40.078 grams.

  4. Molar mass • Also called formula mass. • Or gram formula mass.

  5. Molar Mass of Compounds • = sum of the masses of the atoms in the formula. • Round atomic masses to the nearest tenth. • Ex: H2O • 2 X H = 2 X 1.0 = 2.0 • 1 X O = 1 X 16.0 = 16.0 • Sum = 2.0 + 16.0 = 18.0

  6. Molar Mass of Compounds • Try CH4 • 1 X C = 1 X 12.0 = 12.0 • 4 X H = 4 X 1.0 = 4.0 • Sum = 4.0 + 12.0 = 16.0

  7. Molar Mass of Compounds • Try CO2 • 1 X C = 1 X 12.0 = 12.0 • 2 X O = 2 X 16.0 = 32.0 • Sum = 12.0 + 32.0 = 44.0

  8. Molar Mass of Compounds • Try NaCl • 1 X Na = 1 X 23.0 = 23.0 • 1 X Cl = 1 X 35.5 = 35.5 • Sum = 23.0 + 35.5 = 58.5

  9. Molar Mass of Compounds • Try C6H12O6 • 6 X C = 6 X 12.0 = 72.0 • 12 X H = 12 X 1.0 = 12.0 • 6 X O = 6 X 16.0 = 96.0 • Sum = 72.0 + 12.0 + 96.0 = 180.0

  10. Molar Mass of Compounds • Try Cu(OH)2 • 1 X Cu = 1 X 63.5 = 63.5 • 2 X O = 2 X 16.0 = 32.0 • 2 X H = 2 X 1.0 = 2.0 • Sum = 63.5 + 32.0 +2.0 = 97.5

  11. Molar Mass of Compounds • Try Al(NO3)3 • 1 X Al = 1 X 27.0 = 27.0 • 3 X N = 3 X 14.0 = 42.0 • 9 X 0 = 9 X 16.0 = 144.0 • Sum = 27.0 + 42.0 + 144.0 = 213.0

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