A gas mixture of a known composition is frequently required for different purposes, e.g., in the calibration

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A gas mixture of a known composition is frequently required for different purposes, e.g., in the calibration of gas analyzers. It is desired to prepare a gas mixture of 80% ethylene and 20% carbon dioxide (mole basis) at 10 MPa, 25C in an uninsulated, rigid 50-L tank. The tank is initially to contain CO2 at 25C and some pressure P1. The valve to a line flowing C2H4 at 25C, 10 MPa, is now opened slightly, and remains open until the tank reaches 10 MPa, at which point the temperature can be assumed to be 25C. Assume that the gas mixture so prepared can be represented by Kay’s rule and the generalized charts. Given the desired final state, what is the initial pressure of the carbon dioxide, P1?
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Fundamentals of Thermodynamics

ISBN: 978-0471152323

6th edition

Authors: Richard E. Sonntag, Claus Borgnakke, Gordon J. Van Wylen

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