A fuel cell’s thermodynamic voltage change Δ V measure in millivolts is linearly dependent on theoperating temperature T measured in °C. This relationship follows the equation:Δ V =Δ V 0+ SnF TWhere S is the entropy of the system, Δ V 0 is the initial voltage difference, and nF is a constant.a) If the quantity of nF = 193 (J/mV), determine both the initial voltage difference and the entropy of theS and write the equation of the line Δ V (T ).b) Plot the graph of Δ V as a function of T in Excel and copy and paste the graph into Word. Be sure toproperly label the graph and clearly indicate the slope and y-intercept on the graph.T(°C) Δ V (mV )25.0 49.080.0 -28.0

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A fuel cell’s thermodynamic voltage change Δ V measure in millivolts is linearly dependent on the
operating temperature T measured in °C. This relationship follows the equation:
Δ V =Δ V 0+ S
nF T
Where S is the entropy of the system, Δ V 0 is the initial voltage difference, and nF is a constant.
a) If the quantity of nF = 193 (J/mV), determine both the initial voltage difference and the entropy of the
S and write the equation of the line Δ V (T ).
b) Plot the graph of Δ V as a function of T in Excel and copy and paste the graph into Word. Be sure to
properly label the graph and clearly indicate the slope and y-intercept on the graph.
T(°C) Δ V (mV )
25.0 49.0
80.0 -28.0
 

 

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