CHE 111- Mole Conversions

• Atoms of an element → amount of element in moles

OR

• Formula units or molecules of a compound → amount of compound in moles

1 mol = 6.022 × 10²³ atoms

• Amount of an element in moles → mass of element in grams

OR

• Amount of compound in moles → Mass of compound in grams

1 mol = (atomic mass)g

Formula mass

The sum of the atomic masses of the atoms or ions in a compound’s formula

1. How many C₄H₁₀ molecules are contained in 9.213 grams of this compound?

2. How many hydrogen atoms?

1. 9.55 × 10²² C₄H₁₀ molecules

2. 9.55 × 10²³ atoms

Chemical formula

The number of atoms in a compound or moles of atoms in a mole of a compound

Isotope

Atoms with the same number of protons but a different number of neutrons