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125-01 Extent of Reaction.pdf - Stoichiometry Objective o...

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AUGUST 10, 2017
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Stoichiometry Objective o to indicate how many chemical reactions should be considered in a multiple reaction system
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Stoichiometry Relevance in Chemical Reaction Engineering o to quantify all the state quantities in the reactor o to determine the number of design equations necessary to describe the reactor operation
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chemical formula stoichiometric relation reaction pathways elementary reaction Chemical Reaction ?𝐎 + ? ? 𝐎 ? → ?𝐎 ?
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Stoichiometry Consider the chlorination of methane to trichloromethane Reaction does not occur but may be expressed as the sum of the following reactions ?𝐇 ? + ?𝐥 ? → ?𝐇 ? ?𝐥 + 𝐇?𝐥 ?𝐇 ? ?𝐥 + ?𝐥 ? → ?𝐇 ? ?𝐥 ? + 𝐇?𝐥 ?𝐇 ? ?𝐥 ? + ?𝐥 ? → ?𝐇?𝐥 ? + 𝐇?𝐥 ?𝐇 ? + ??𝐥 ? → ?𝐇?𝐥 ? + ?𝐇?𝐥
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Stoichiometric Coefficients Sign conventions o reactants (-) o products (+) o inerts (0) Sum of stoichiometric coefficients ?? + ?? → ?? + ?? J j A B C j  
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Stoichiometric Coefficients Dimensionless o expressed in terms of moles of species j and moles of extent For a balanced chemical reaction 0 J j j j MW
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Stoichiometric Coefficients The largest coefficient of any species is 1 or the smallest coefficient of any species is the smallest integer ?𝐎 + ?
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