Moles Relations

List 3 examples of counting units

pair of dice is two die

a dozen egg is 12

bale of paper is 5000 sheets

Define mole

unit used when counting atoms or molecules

What does a mole represent

6.022×10²³ of entity counted (particles in the case of atoms or molecules)

Define molar mass

amount of mass present in 1 mole of a substance

What is molar mass of an element equal to

mass of 1 mol of atoms of that element

Explain how molar mass of an element and atomic weight are related

a mole of an element has a mass in grams equal to its atomic weight in amu

What can we use Avogadro’s number and molar mass to convert between

units of mass and particle number

What is the formula to convert moles to mass

multiple by molar mass

What is the formula to convert mass to mole

divide by molar mass

How to convert from mol to number

multiply by Avogadro’s number

How to convert from number to mole

dividing by Avogadro’s number

Explain whether we can convert mass directly to number

no, we have to convert mass to moles 1st

What does molecular formula provide

a mole ratio of atoms in a compound/unit

Water (H2O) has how many atoms

2 H atoms, 1 O atom

1 mole H2O has how many moles

Two moles H atoms, 1 mole O atoms

How is molar mass found (3 things)

identifying the atoms in a molecule

how many of each atom

molar atomic mass of each atom

What does each element contribute to

a fraction of the compound’s mass

How to determine mass % for a molecule of compound

molecular mass and chemical formula

How to find mass % on a mole basis for a mole of compound

molar mass and formula