# Molar Heat Capacity Explained

What is molar heat capacity? What is its associated formula? How is it calculated? Read to find all the answers.

Omkar Phatak

Definition

The molecular weight of the substance, expressed in grams is known as a single mole. It is known to contain 6.023 x 10

^{23}molecules. For example, the molar mass of water is approximately 18 gm/mol.*The molar heat capacity of a substance is the amount of heat required to raise the temperature of one mole of a substance or compound through one degree Celsius.*Since the molecular weight and structure of each compound varies, every substance has a unique value.

*Molar Heat Capacity (Joules/Mol K) = [Specific Heat Capacity (Joules/gm K) x Molar Mass (gm/Mol)]*

How is it Calculated?

To use the above formula for any substance, you need to know how to calculate molar mass and have a reference chart that has the specific heat capacity of that substance.

*Molar Heat Capacity of Water = (4.1813 Joule/gm K) x (18 gm/mol) = 75.2634 Joule/Mol K*