Chemistry Test 2

A mole (mol) is just another unit that you can use in chemistry. It is another conversion/way to count.

A number used in the conversion factor of a mole. 1 mole = 6.02 x 10^23 (Avogadro’s number) atoms, molecules, particles, etc.

Subscripts tell you how many moles of one particle are in one mole of a compound. A mole is not a container, it Is a counting unit. For example, this is like saying in 1 dozen bicycles, there are 2 dozen wheels and 1 dozen frames.

ex) aspirin - C9H8O4 for every one mole of C9H8O4, there are 4 moles of oxygen. 4 moles of O/ 1 mole of C9H8O4 and vice versa. This will allow you to convert the number of O mols into a different amount of moles before turning it into particles, atoms, etc.

the mass of a substance in relation to moles (in grams). g/mol

find the mass in grams on the periodic table of each individual molecule, then add it all together. This creates a conversion factor that can convert something into moles. Because every element is different, we have to create the conversion factor by doing this.

Because there is no conversion factor for mass directly to atoms, you have to first convert the mass to moles, then the moles to atoms by using Avogadro’s number.

the number if moles in a solute per litre of solution. Also known as molar concentration. Molarity is just the concentration of moles in a solution.

The substance in a solution present in the largest amount. This is what is used to dissolve other substances. ex) water in a kool-aid mixture

substances that are present in a solution in lesser amounts. Usually this is what is being “watered down.”

M = n/v where… M = molarity n = number of moles V = number of litres

M

the process of preparing a less concentrated solution from a more concentrated one.

Mi = initial molarity Vi = initial volume Mf = final molarity Vf = final volume Mi>Mf and Vi<Vf

Do a regular unit conversion using Avogadro’s number.

Create your own conversion factor with the number of moles of that element per mole of the compound. Then you have to convert that to however many moles you are trying to find, then convert that into atoms, molecules, etc.

Find the molar mass of the compound and make the unit conversion. Then convert as normal.

Find molar mass of compound, then convert this to moles. Next, convert the moles to atoms by using Avogadro’s number.

use the m=n/v formula.

use the formula MiVi=MfVf