since your units said j/mol. C, which means you are looking for molar heat capacity, then that is 75.40 j \(mol^{-1} C^{-1}\)
Specific heat capacity of water in j \(g^{-1} C^{-1}\) is 4.184, which has a mass unit in grams.
The molar heat capacity of water at liquid temperature is 75.40 j \(mol^{-1} C^{-1}\), which takes the same units as you presented in your question.
