Molecular Weight and Molar Mass

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Presentation transcript:

Molecular Weight and Molar Mass Molecular weight is the sum of atomic weights of all atoms in the molecule. example: NaCl has a molecular weight of 58.5 a.m.u. this is composed of a single molecule of NaCl Molar mass = molecular weight in grams. example: NaCl has a molar mass of 58.5 grams this is composed of a 6.02 x1023 molecules of NaCl

The Molar Mass and Number of Particles in One-Mole Quantities Substance Molar Mass Number of Particles in One Mole Carbon (C) 12.0 g 6.02 x 1023 C atoms Sodium (Na) 23.0 g 6.02 x 1023 Na atoms Iron (Fe) 55.9 g 6.02 x 1023 Fe atoms NaF (preventative 42.0 g 6.02 x 1023 NaF formula units for dental cavities) CaCO3 (antacid) 100.1 g 6.02 x 1023 CaCO3 formula units C6H12O6 (glucose) 180.0 g 6.02 x 1023 glucose molecules C8H10N4O2 (caffeine) 194.0 g 6.02 x 1023 caffeine molecules

Chemical Equations