Physics Help: fuel cells. 10 points!?

bambam

New member
Consider a 1 kW fuel assembly operating at 50 percent efficiency. How many L of water does it produce per hr? If it's fuel is CH4, what fraction of a cubic metro does it consume ea. Hour and what is the cost if natural gas costs 25 cents per m^3?

Having so much trouble with this problem. I would really appreciate any guidance. Thanks in advance!
 
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