Molar Enthalpy Calculator:
Enter the values of total change in enthalpy, dH(J) and total number of moles, n to determine the value of Molar enthalpy, Hm(J/mol).
Molar Enthalpy Formula:
Molar enthalpy is the enthalpy change associated with a chemical reaction per mole of substance. It is typically measured in joules per mole.
Molar enthalpy indicates the amount of energy absorbed or released by the reaction involving one mole of a reactant or product. This concept is crucial in thermodynamics and helps compare the energy changes of different reactions regardless of the quantity of reactants used.
Total enthalpy change represents the total amount of heat absorbed (positive) or released (negative) during the reaction.
Number of moles considers the quantity of the substance participating in the reaction. By dividing the total enthalpy change by the number of moles, we get the enthalpy change per mole of the substance.
A chemical reaction occurs, involving a specific number of moles (n) of a substance. The reaction absorbs or releases heat, resulting in a total enthalpy change.
Molar enthalpy is calculated by dividing the total enthalpy change by the number of moles (n) of the substance. This gives us the specific enthalpy change per mole of the substance involved.
Molar enthalpy, Hm(J/mol) in joules per mole is calculated by dividing the total change in enthalpy, dH(J) in joules by total number of moles, n.
Molar enthalpy, Hm(J/mol) = dH(J) / n
Hm(J/mol) = molar enthalpy in joules per mole, J/mol.
dH(J) = total change in enthalpy in joules, J.
n = total number of moles.
Molar Enthalpy Calculation:
- Finding Molar Enthalpy:
Given: dH(J) = 500J, n = 2moles.
Molar enthalpy, Hm(J/mol) = dH(J) / n
Hm(J/mol) = 500 / 2
Hm(J/mol) = 250J/mol.
- Finding Total Enthalpy Change:
Given: Hm(J/mol) = 150J/mol, n = 4moles.
Molar enthalpy, Hm(J/mol) = dH(J) / n
dH(J) = Hm(J/mol) * n
dH(J) = 150 * 4
dH(J) = 600J.