CHE 2A Lecture Notes - Lecture 6: Silicon Carbide, Silicon Dioxide, Stoichiometry
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CHE 2A Full Course Notes
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Chemistry 2a lecture 6 notes stoichiometry continued and types of reactions. Oct 12th, 2017, professor o. gulacar, uc davis. % yield = {actual (lab) yield/ theoretical yield} x 100. To remember: actual/theoretical you ask first then say thank you. Both can be in moles or yield as long as both are in the same unit. Calculate the theoretical and % yields of kcl. K2co3 + 2 hcl 2kcl + h2o + co2. 1 : 2 : 2 : 1 : 1. 1 mole k2co3 = (39x2) + 12 + (16x3) = 138g so, 45. 8g of k2co3 = 0. 332 moles of k2co3. K2co3 : kcl = 1 :2 so we expect (theoretical) 0. 332 x 2 = 0. 664 moles of kcl to form. From the lab experiment (actual) we got 46. 3g kcl. 1mole kcl = 39+35 = 74g so, 46. 3g kcl = 0. 626 moles of kcl actual < theoretical ; 0. 626 moles < 0. 664 moles.
