CHEM 102 Lecture Notes - Lecture 18: Reagent, Stoichiometry, Activation Energy
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Chem 102: general descriptive chemistry ii - lecture 18: catalysts and chemical. Enzymes: catalysts in a biological system, the substrate fits into the active site of the enzyme much like a key fits into a lock, enzymes are specific for the substrate. Example problem: write kc for a reaction, ch4 + 2h2s cs2 + 4h2 kf [ch4][h2s] = kr [cs2][h2] (kf / kr) = ( [cs2] [h2]4 / [ch4] [h2s]2 ) Relating kp and kc: kp and kc are not equal, conversion equation comes from the ideal gas law, formula, kp = kc (rt)change in n. N is the change in moles of gaseous products: find by subtracting the moles of gaseous reactants from the moles of gaseous products. Example problem: calculating n : n2 + 3h2 2nh3, moles nh3 (moles n2 + moles h2, = -2. If k > 1, the reaction is product-favored. If k < 1, the reaction is reactant-favored.
