Two kilograms of steam initially at 400ºC expand in an insulated cylinder from a pressure of 800 kPa to 100 kPa. Assuming no friction, the work produced is nearest:

A) 640 kJ
B) 720 kJ
C) 780 kJ
D) 830 kJ


C) 780 kJ

W = ?m(u2 ? u1) = ?2× (2570 ? 2960) = 780 kJ

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A) closed corporation B) private corporation C) classic partnership D) limited partnership

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Indicate whether the statement is true or false

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