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A mixture of methane (CH4) and air is flammable only if the molar percentage of methane is between 5% and 15%. A mixture containing 9.0% molar methane in air flowing at a rate of 7.00 × 10^2 kg/h must be diluted with pure air to reduce the methane concentration to the lower flammability limit. Calculate: (a) the required air flow rate in kmol/h; (b) the flow rate of the gas mixture (final gas stream); (c) the mass percentage of oxygen in the final gas stream. Consider that air has 21% molar of O2 and 79% molar of N2.

A mixture of methane (CH4) and air is flammable only if the molar percentage of methane is between 5% and 15%. A mixture containing 9.0% molar methane in air flowing at a rate of 7.00 × 10^2 kg/h must be diluted with pure air to reduce the methane concentration to the lower flammability limit. Calculate: (a) the required air flow rate in kmol/h; (b) the flow rate of the gas mixture (final gas stream); (c) the mass percentage of oxygen in the final gas stream. Consider that air has 21% molar of O2 and 79% molar of N2.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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A mixture of methane (CH4) and air is flammable only if the molar percentage of methane is between 5% and 15%. A mixture containing 9.0% molar methane in air flowing at a rate of 7.00 × 10^2 kg/h must be diluted with pure air to reduce the methane concentration to the lower flammability limit. Calculate: (a) the required air flow rate in kmol/h; (b) the flow rate of the gas mixture (final gas stream); (c) the mass percentage of oxygen in the final gas stream. Consider that air has 21% molar of O2 and 79% molar of N2.

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