Apply a first law analysis to the overall system including the electrical work, the heat released, and the chemical energy in the fuel. Does the fuel cell make an interesting energy source for a house, assuming that it can provide the needed electrical energy and that the heat can be used to provide some heating and hot water?

The fuel cell provided has a weight of 1.85 kg and a volume of 1.75 x 10^-3 m³. The pressurized hydrogen tank holding 6.12 m³ of hydrogen at 15.2 MPa weighs 60 kg. The cost of this tank of fuel is $50. Use this data to compare a fuel cell to a gasoline internal combustion engine as a mobile power source. Take the cost of gasoline to be $0.40 / liter

What price would hydrogen need to be for the cell to be a good home power or mobile powerplant device? Take the price of gasoline and natural gas as an indicator of an acceptable fuel price.