Problem 4 (+3 kg of oxygen is sealed in a rigid container at 150°C and 250 kPa. The gas is heated in a constant volume process until itspressure becomes four times the initial pressure. Given the specific gas constant R = 0.259 kJ/kg.K and the specific heat atconstant volume Cv = 0.658 kJ/kg.K. Determine:(a) The change in enthalpy of the gas in KJ.(b) Heat transfer during the process.

Answered: Image /qna-images/answer/a468ab4c-091b-44cc-8a2e-65544e1c9fa6.jpg

Answered: Problem 4 (+ 3 kg of oxygen is sealed…

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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Air as an ideal gas is contained in a piston/cylinder system constrained by a non-linear spring. Initially the gas in the cylinder is at 100 kPa, which is balanced by the atmospheric pressure outside of the cylinder (the weight of the piston is negligible). The force on the spring at the start is zero. The spring force is F=kx². k=600. kNt/m². The cross-sectional area of the piston is 1 m², the initial volume is 1 m³, and the initial temperature is 300 K. Heat is added until the volume of the gas has expanded to 1.5 m³. Find: (a) The work done by the gas on the face of the piston (kJ). (b) The final temperature (K). (c) The amount of heat added (kJ). Hint: This problem is easiest if you calculate the spring work and the atmospheric work separately. Air V₁=1.0 m³ Piston Area = 1.0 m² T₁=300 K P₁=100 kPa Atmospheric P on upper piston face= 100 kPa
X=6
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Nitrogen is isobarically expanded from 100 kPa and 600 K until the volume doubles in a closed piston-cylinder. Assume that specific heats are constant and evaluated at the average temperature. Hint: Nitrogen is an ideal gas.Determine the amount of heat transfer into the system, in kJ/kg? Calculate the change of enthalpy, in kJ/kg?Calculate the change of internal energy, in kJ/kg? Report your answer to the nearest whole number using rounding.

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