The formula to convert energy from joules to joules per mole (Em) is:
\[ E_{m} = \frac{E}{n} \]
Where:
Let's say the energy (\( E \)) is 500 Joules, and the amount of substance (\( n \)) is 2 moles. Using the formula:
\[ E_{m} = \frac{500}{2} \]
We get:
\[ E_{m} = 250 \]
So, the energy per mole (\( E_{m} \)) is 250 J/mol.
Suppose the energy (\( E \)) is 1200 Joules, and the amount of substance (\( n \)) is 3 moles. Using the formula:
\[ E_{m} = \frac{1200}{3} \]
We get:
\[ E_{m} = 400 \]
So, the energy per mole (\( E_{m} \)) is 400 J/mol.
Energy per mole is a way of expressing the energy associated with a certain amount of substance. It is commonly used in chemistry and physics to describe the energy involved in chemical reactions or physical changes per mole of substance. This unit is particularly useful when comparing the energy of reactions involving different amounts of reactants or products.