The Math of Chemistry (A to Z)

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express the amount of a substance. It is defined as the amount of substance that contains as many entities (atoms, molecules, etc.) as there are in 12 grams of carbon-12.

Front

How do you calculate the number of moles from volume and molarity?

Back

Number of moles = Volume (L) × Molarity (mol/L).

Front

What is the empirical formula?

Back

The empirical formula is the simplest whole-number ratio of atoms of each element in a compound.

Front

How do you determine the empirical formula from percent composition?

Back

Convert the percentage of each element to grams, then to moles, and divide by the smallest number of moles to find the simplest ratio.

Front

What is specific heat capacity?

Back

Specific heat capacity is the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius.

Front

How do you calculate heat energy using specific heat?

Back

Heat energy (Q) = mass (g) × specific heat (J/g°C) × change in temperature (°C).

Front

What is the relationship between moles and mass?

Back

Moles = Mass (g) / Molar mass (g/mol).

Front

What is molar mass?

Back

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

How do you convert grams to moles?

Back

To convert grams to moles, divide the mass of the substance by its molar mass.

Front

What is the formula for calculating the number of moles from mass?

Back

Number of moles = Mass (g) / Molar mass (g/mol).