What is the value of the specific heat capacity of liquid water in j/mol·°c?

Since your units said j/mol. C, which means you are looking for molar heat capacity, then that is 75.40 j

Specific heat capacity of water in  j is 4.184, which has a mass unit in grams.

The molar heat capacity of water at liquid temperature is 75.40 j , which takes the same units as you presented in your question.

I’d have to say no because without oxygen in the water the fish would all be dead. so if you want to fish for dead fish, pick the ponds with the lowest oxygen concentrations.