PPT Slide
- For compounds, the molecular mass (in amu) is numerically the same as the mass of one mole of the compound in grams.
- Skill 3-1 Calculate the molecular mass of a compound as the sum of the atomic masses of its elements.
- Molecular mass H2O = (2 x atomic mass of H) + atomic mass of O = 2(1.008 amu) + 16.00 amu = 18.02 amu
- So, one mole of water (6.022 x 10 23 molecules) has a mass of 18.02 g.
- Molar mass of NaCl = atomic mass of Na (22.99 amu) + the atomic mass of Cl (35.45 amu) 22.99 + 35.45 = 58.44 amu
- One mol of NaCl (6.02 x1023 formulas) has a mass of 58.44 g.