(50 points) The Importance and Use of \"Basis\". Suppose that an analysis of sta
ID: 718102 • Letter: #
Question
(50 points) The Importance and Use of "Basis". Suppose that an analysis of stack gas exiting a coal-fired power plant contains: 2. 8.0 mole 9% carbon dioxide, CO 3.2 mole % oxygen, O2 16.1 mole % water vapor, H2O 72.7 mole % nitrogen, N2 Is mole% or mass % more appropriate and most oftenused for gas mixtures? Determine the molecular weight of the mixture. 27. Report the analysis as the mole % of each component on a water-free basis, why do chemical engineers often report analyses on a water-free basis? 9.Ce co 3 a. b. d. Determine the molecular weight of the mixture on a water-free basis. 2. e. Report the analysisas the mass % of eachcomponent, including all components of e ana co3 t7.o the gas mixture.t oo Report the analysis as the mass % of each component on a water-free basis. 73,27%NExplanation / Answer
Part c
Basis - 100 mol of gas mixture
Moles of CO2 = 100 x 8/100 = 8 mol
Moles of O2 = 100 x 3.2/100 = 3.2 mol
Moles of H2O = 100 x 16.1/100 = 16.1 mol
Moles of N2 = 100 x 72.7/100 = 72.7 mol
On a water free basis
Moles of gas mixture T = 100 - 16.1 = 83.9 mol
Mol % of CO2 = moles of CO2 x 100 / T
= 8*100/83.9
= 9.535 %
Mol% of O2 = 3.2*100/83.9
= 3.814 %
Moles of N2 = 72.7*100/83.9
= 86.651 %
Water free basis gives the clear idea of the composition of the components present in the mixture. Water removal or addition is a very common process in the practical applications of the process plants. Whenever the water is processed, the composition of the mixture changes due to the addition or removal of the water. Therefore to remain the concentration on water free basis becomes important. On a water free basis calculation the composition remains the same.
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