# Specific Enthalpy Calculator, Formula, Specific Enthalpy Calculation

## Specific Enthalpy Calculator:

Enter the values of change in enthalpy, dH(J), molar mass, mm(g/mol) and number of moles, n to determine the value of Specific enthalpy, Esp(J/g).

 Enter Change in Enthalpy: J Enter Molar Mass: g/mol Enter Number of Moles: Result – Specific Enthalpy: J/g

## Specific Enthalpy Formula:

Specific enthalpy is the enthalpy per unit mass of a substance. It is typically measured in joules per gram (J/g).

Specific enthalpy allows for the comparison of energy changes in substances irrespective of their quantities, making it particularly useful in thermodynamic calculations involving fluids and gases.

Change in enthalpy – the difference in the total energy of the substance between two states (usually denoted by the final state minus the initial state).

Molar mass of the substance – the mass of one mole of the substance.

Number of moles – the amount of the substance expressed in moles.

A substance undergoes a change in state (e.g., heating steam or compressing a gas). This change involves an overall gain or loss of energy.

Specific enthalpy provides a convenient way to track energy changes in a system undergoing thermodynamic processes (like heating, cooling, or expansion). It considers both the internal energy of the substance (the energy of its atoms and molecules) and the potential for external work due to pressure and volume changes.

Specific enthalpy, Esp(J/g) in joules per gram is calculated by dividing the change in enthalpy, dH(J) in joules by the product of molar mass, mm(g/mol) in grams per mole and number of moles, n.

Specific enthalpy, Esp(J/g) = dH(J) / mm(g/mol) * n

Esp(J/g) = specific enthalpy in joules per gram, J/g.

dH(J) = change in enthalpy in joules, J.

mm(g/mol) = molar mass in grams per mole, g/mol.

n = number of moles.

### Specific Enthalpy Calculation:

1. Finding Specific Enthalpy:

Given: dH(J) = 5000J, mm(g/mol) = 10g/mol, n = 1mol.

Specific enthalpy, Esp(J/g) = dH(J) / mm(g/mol) * n

Esp(J/g) = 5000 / 10 * 1

Esp(J/g) = 500J/g.

1. Finding Total Enthalpy Change:

Given: Esp(J/g) = 20J/g, mm(g/mol) = 8g/mol, n = 1mol.