Use of Formulae Masses and Moles (but no badgers).

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Presentation transcript:

Use of Formulae Masses and Moles (but no badgers)

Formula Mass Sum of all the average atomic masses of all the atoms in the formula for the compound Example: Find formula mass for potassium chlorate First: find formula!

Formula mass problem continued Then: Mass of K: 1 atom/mole x amu/atom = amu Mass of Cl: 1 atom/mole x amu/atom = amu Mass of O: 3 atoms/mole x amu/atom=48.00 amu Formula mass = amu amu amu = amu

Molar Mass Mass of one mole of the compound Numerical value is equal to formula mass Units are grams!

Problem: Find molar mass of barium nitrate First, find formula! Then: Barium: 1 mole x g/mole = g Nitrogen: 2 mole x g/mole = g Oxygen: 6 mole x g/mole = g Sum: g g g = g/mole

Conversion: Molar mass can be used to convert from grams to moles and back again Show all your work! Do Sample problem 7-8 and 7-9