| A | B |
|---|
| What is a mole? | A mole is the number of atoms, molecules, or formula units in a sample of a substance |
| What is Avogrado's number? | 6.02 x 10^23 |
| What are the numbers of atoms in a mole? | 6.02 x 10^23 |
| What is molar mass? | The mass in grams of one mole of any pure substance. The molar mass of any element is numerically equal to its atomic mass and has the units g/mol. |
| How do you make the direct conversion from mass to atoms? | You must first convert the mass to moles by mutliplying by a conversion factor that relates moles and mass. That conversion factor is Avogrado's number. |
| How do you find the molar masses of compounds? | It is equal to the sum of the masses of every particle that make up the compound. |
| How do you find the percent composition of a compound? | Divide the mass of an element by the mass of the compound and multiply by 100 |
| What is the empirical formula for a compound? | The formula with the smallest whole-number ratio of elements |
| What is the molecular formula? | it specifies the actual number of atoms of each element in one molecule or formula unit of the substance. |
| What are hydrates? | solids in which water molecules are trapped |
| What is anhydrous? | without water |
| How do you determine the formula for a hydrate? | You must first find the number of moles associated with one mole of hydrate |
