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Chem-Chapter 10
The Mole
| Question | Answer |
|---|---|
| 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
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