Air at 15°C and 100 kPa occupies 0.03 m³. The air is heated at constant volume until the pressure is 400 kPa, and then cooled at constant pressure back to the original temperature. Calculate the net entropy change in kJ/kg.K.

Air at 15°C and 100 kPa occupies 0.03 m³. The air is heated at constant volume until the pressure is 400 kPa, and then cooled at constant pressure back to the original temperature. Calculate the net entropy change in kJ/kg.K.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.

Question

Choose the correct option.

Air at 15°C and 100 kPa occupies 0.03 m³. The air is heated at constant volume until the pressure is
400 kPa, and then cooled at constant pressure back to the original temperature. Calculate the net
entropy change in kJ/kg.K.
Lütfen birini seçin:
a.-0.398
b.-1.393
c.-2.388
d.0.995

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