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# Chem-Chapter 10

### The Mole

what is a mole? A unit that is a specialized number of particles. Representation of particles in a substance.
Avogadro's number 6.02 x 10 23
What is a representative particle? Species present in a substance (e.g. atoms, molecules, formula units)
What is a molar mass? Mass of a mole of an element (e.g. Molar mass of C = 12.0 g
What are the methods for measuring the amount of something? 1. count 2. mass 3. volume
What are three ways of measuring the amount of a substance (give an example of heach) 1. count-box of nails2. mass - bag of hamster food3. volume-gallon of paint
What is dimensional analysis? Tool used for solving conversion problems--problems in which a measurement must be expressed in a different unit.
How is Avogadro's number related to a mole of any substance? A mole of any substance contains Avogadro's number of representative particles or 6.02 x 10 23 rep particles.
How many representative particles are in a mole? 6.023 x 10 23
How is the atomic mass of an element related to the molar mass of an element? Expressed as amu-the atomic mass of an element is expressed in grams is the mass of a molecule of the element.
What is the equation for finding the # particles to moles? # of moles = total number of particles ------------------------ 6.02 x 1023
How is the molar mass of a compound calculated? Find the number of grams of each element in one mole of the compound. Then add the masses of the elements in the compound.
mass of the sample # of moles of the substance = ---------------------------
Created by: atownley