CHEN 3102 Study Guide - Midterm Guide: Stoichiometry, Fugacity, Ideal Gas
28 Feb 2015
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Thermodynamics: = h rxn o, t srxn. When determining any thermodynamic quantity for a rxn, G<0 favorable (possible by decreasing enthalpy or increasing entropy(occurs when molecules become more floppy, generate more net moles, or w/ higher t)) (products reactants) i. H <0 exothermic (more favorable) (doesn"t just have to be at standard state) Extent of reaction = (in some cases, might be more beneficial to use fractional conversion) For problems, make table of species, initial moles, final moles (moles at time t), mole fraction (only gases count) d i dt. V d i dt = d i dt for constant volume batch (stoichiometric coefficient = -1) If rt ea, then molecules can easily exceed activation energy barrier fast rxn . if not, then slow. For gas ai= yi i p yi=mole fraction. P = pressure for ideal gas: by 1 bar) ai yi p [ ] (yip is divided o. For a liquid, ai= xi i f i.
