When ammonia dissociates into hydrogen and nitrogen according to NH3 0.5 N2 + 1.5 H2, the number

When ammonia dissociates into hydrogen and nitrogen according to NH3 0.5 N2 + 1.5 H2, the number of moles of gas are increased. An engineer has proposed that the increased number of moles of gas could increase the pressure and thus the power output of a turbine. As a preliminary evaluation of this concept, assume ammonia enters an isentropic turbine at 300◦C and 3.5 bar and is exhausted to 1 bar. Assume ideal gas behavior.

a) Calculate the work per mole of ammonia, assuming dissociation does not occur.

b) Calculate the work per mole of ammonia, assuming chemical equilibrium is achieved. Compare the result with the value from part (a).


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