# Converting enthalpy from J/g to kJ/mol [closed]

On some books I found values of enthalpy in J/g, on other books in kJ/mol. How could I convert enthalpy from J/g to kJ/mol?

Thank you.

## closed as off-topic by FGSUZ, Jon Custer, Buzz, ZeroTheHero, Kyle KanosJan 4 at 11:01

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You need to know the molar mass $M$ ($\mathrm{g/mol}$) of the material (substance).
Say the Enthalpy in $\mathrm{J/g}$ is $H_w$, then the Enthalpy in $\mathrm{J/mol}$ is $H_M$, with:
$$H_M=H_w\times M$$
Divide by $1000$ to convert to $\mathrm{kJ/mol}$.
If the material is not a pure substance (i.e. a mixture) then you need to calculate a molar average for $M$ of the material.