Understanding Moles and Molar Mass in Chemistry

These flashcards cover key vocabulary and concepts related to moles and molar mass in chemistry, providing definitions and examples for better understanding.

Mole

A measurement in chemistry equal to the molar mass of a substance, containing Avogadro's number of atoms or molecules.

Molar Mass

The mass of one mole of a substance, typically expressed in grams per mole (g/mol), calculated from the periodic table.

Avogadro's Number

6.022 x 10^23, the number of atoms or molecules in one mole of a substance.

Scientific Notation

A method of writing large numbers in the form of a x 10^n, where 'a' is a number between 1 and 10 and 'n' is a whole number.

Example of Molar Mass - Water

The molar mass of water (H2O) is 18 grams per mole, calculated from 2 grams for hydrogen and 16 grams for oxygen.

Practical Use of Moles

Moles are used to count atoms and molecules in a practical way, especially since individual atoms and molecules are too small to count directly.

Conversion Formula for Moles

To find the number of molecules, multiply the number of moles by Avogadro's number (6.022 x 10^23).

Conversion from Mass to Moles

To calculate the number of moles from mass, divide the mass (in grams) by the molar mass (g/mol).