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I have to calculate the thermodynamic efficiency of a power station. I have to assume the cooling towers maintain 70 degrees C and hence the amount of electrical energy (in J) from one mole of methan. I've been given the enthalpy of combustion of Methane. I know the thermo efficiency is (sum of net useful power + and useful thermal outputs) / total fuel input.....(am i right?) i just cant figure out how to get the electrical energy!! I have figured out how many moles of water the combustion of methane heats, and figured out the energy needed to take that one mole to steam at 500 degrees C (a question earlier i think it has relevance) but thats all i got, i dont know how to calculate the electrical energy output from just this information!! Is there something in the question missing, or am i missing something?? Any help is greatly appreciated as i've been up all night doing this thanks