Helium in a piston/cylinder at 20°C, 100 kPa is brought to 400 K in a reversible polytropic process with exponent n = 1.25. Helium can be assumed to be an ideal gas with constant specific heat. Find the specific work.

Helium in a piston/cylinder at 20°C, 100 kPa is brought to 400 K in

1.	Helium in a piston/cylinder at 20°C, 100 kPa is brought to 400 K in a reversible polytropic process with exponent n = 1.25. Helium can be assumed to be an ideal gas with constant specific heat. Find the specific work.
A.	-587.7 kJ/kg
B.	-687.7 kJ/kg
C.	-787.7 kJ/kg
D.	-887.7 kJ/kg
Answer» E.

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Helium in a piston/cylinder at 20°C, 100 kPa is brought to 400 K in a reversible polytropic process with exponent n = 1.25. Helium can be assumed to be an ideal gas with constant specific heat. Find the specific work.

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