Chem HNs - Moles and Mass

Mole

Unit used in chemistry to describe the amount of a substance in a ample of an element or compound 

Formula Unit

A single representation of an ionic compound, similar to a molecule for a covalent compound

Avogadro’s number

The quantity 6.02 × 10²³ of any object (typically particles like atoms, molecules, etc) that 1 mole is defined as

Empirical Formula

The simplest whole number ration formula for a compound, typically determined using mass data

Percent Composition

The percent by mass of a specific element in a given compound

Molar Mass

The mass in grams of one mole of an element or compound

Molecular Formula

The actual formula for a compound - determined as a whole number multiple of the compounds empirical formula 

Theoretical Value

An expected or “correct” value to be obtained in an experiment 

Experimental Value

A value calculated from real-life experimental results

Molar Volume

The relationship determined that 1 mole of any gas at standard temperature and pressure is equal to 22.4 L is defined as

Percent Error

A measure of experimental accuracy equal to the difference between theoretical and experimental values divided by the theoretical value multiplied by 100