Compressed hydrogen at 15 bar and 50C flows at a steady rate through a throttling valve so that the pressure at the outlet is 1 bar. Assume hydrogen behaves as an ideal gas under these conditions. a) What is the temperature of the hydrogen at the valve outlet? [1 mark] b) What is the change in specific entropy (in Jmol1K1 ) across the valve? [1 mark] The same expansion of hydrogen is now performed across a turbine. Assume the hydrogen is an ideal gas with constant heat capacity (CP). You may assume that changes in kinetic and potential energy across the turbine are negligible, and that the expansion process is adiabatic. c) What is the outlet temperature (in C ) when maximum shaft work is performed. [1 mark] d) What is the maximum shaft work (in Jmol1 ) that can be extracted from the turbine [1 mark] Data: CP(hydrogen)=29.0Jmol1K1 Compressed hydrogen at 15 bar and 50C flows at a steady rate through a throttling valve so that the pressure at the outlet is 1 bar. Assume hydrogen behaves as an ideal gas under these conditions. a) What is the temperature of the hydrogen at the valve outlet? [1 mark] b) What is the change in specific entropy (in Jmol1K1 ) across the valve? [1 mark] The same expansion of hydrogen is now performed across a turbine. Assume the hydrogen is an ideal gas with constant heat capacity (CP). You may assume that changes in kinetic and potential energy across the turbine are negligible, and that the expansion process is adiabatic. c) What is the outlet temperature (in C ) when maximum shaft work is performed. [1 mark] d) What is the maximum shaft work (in Jmol1 ) that can be extracted from the turbine [1 mark] Data: CP(hydrogen)=29.0Jmol1K1