Lec-30-Chap-04-3 - Limiting Reactant CHE 131 Lecture 30...

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CHE 131 Lecture 30 – Limiting Reactants; Yield; Empirical Formulas Chapter 4: pp. 141-153. Limiting Reactant - reactant that limits the amount of product that can be produced. - reactant that is used up first in a reaction. - portion of the other reactants remaining after reaction completion are in excess. - an increase in the amt. of limiting reagent will lead to an increase in amount of product formed. Limiting Reactant EXAMPLE What is the number of moles of CaSO 4 (S) that can be produced by allowing 1.0 mol SO 2 , 2.0 mol CaCO 3 , and 3.0 mol O 2 to react? 2SO 2(g) + 2CaCO 3(s) + O 2(g) 2CaSO 4(S) + 2CO 2(g) balanced equation relates: 2SO 2(g) ¥ 2CaCO 3(s) ¥ O 2(g) have only: 1SO 2(g ) ¥ 2CaCO 3(s) ¥ 3O 2(g) not enough SO 2 to use all of the CaCO 3 or the O 2 not enough CaCO 3 to use up all of the O 2 SO 2 is the limiting reactant
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EXAMPLE What is the number of moles of CaSO 4 (S) that can be produced by allowing 1.0 mol SO 2 , 2.0 mol CaCO 3 , and 3.0 mol O 2 to react? 2SO 2(g) + 2CaCO 3(s) + O 2(g) 2CaSO 4(S) + 2CO 2(g) have only: 1SO 2(g ) 2CaCO 3(s) 3O 2(g) SO 2 is the limiting reactant if use all of SO 2 #CaCO 3 = ( 1 mol SO 2 )(2 mol CaSO 4 /2 mol SO 2 ) = 1 mol CaSO 4 Theoretical Yield - the amount of product produced by a
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Lec-30-Chap-04-3 - Limiting Reactant CHE 131 Lecture 30...

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