A b 40 c 60 d 35 e 50 the overall yield is 040 x 060

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A ---> B 40 % ---> C 60 % ---> D 35 % ---> E 50 % The overall yield is: 0.40 x 0.60 x 0.35 x 0.50 = 0.042 or 4.2 %
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Slide 39 Percent Yields: Working with Moles When 6. mol Al reacts with an excess of O 2 , 1.2 mol Al 2 O 3 are produced. What is the percent yield of Al 2 O 3 ? Consider the reaction: 4 Al(s) + 3 O 2 (g) 2 Al 2 O 3 (s) Actual Yield (AY): AY = 1.2 mol Al 2 O 3 2 3 2 3 2 6 4 ( ) : 3 mol Al O TY mol Al mol Al O mol Al TheoreticalYield TY 1.2 % 100 100 40% 3 AY Yld TY
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Slide 40 68% When 150 g C 6 H 6 burns in an excess of O 2 to form CO 2 and H 2 O, it is found that 345 g CO 2 are produced. What is the percent yield of CO 2 ? M(C 6 H 6 ) = 78 M(CO 2 ) = 44 Percent Yields: Working with Masses Consider the combustion of benzene: 2 C 6 H 6 (l) + 15 O 2 (g) 12 CO 2 (g) + 6 H 2 O(l)
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Slide 41 When 100 g C 2 H 6 is reacted with 300 g O 2 , 220 g CO 2 is produced What is the percent yield of CO 2 ? M(C 2 H 6 ) = 30. M(O 2 ) = 32. M(CO 2 ) = 44. Consider the combustion of ethane: 2 C 2 H 6 (g) + 7 O 2 (g) 4 CO 2 (g) + 6 H 2 O(l) 93%
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Slide 42 Often, the %Yld is known and one wishes to determine how much of a given reactant is required to produce a desired amount of product. Consider the reaction: 2 P(s) + 5 Cl 2 (g) 2 PCl 5 (g) If the percent yield is 40%, how many moles of Cl 2 (g) are required to react with excess P(s) to produce 2. moles of PCl 5 (g)? AY = 2 mol %Yld = 40% 1. min : % 100 AY Yl Deter eTY d TY 5 2 100 100 5 % 40 AY TY mol PCl Yld 2 5 2 5 2. min : 5 5 12.5 2 molCl mol PCl molCl required mol P Deter erequi Cl red Rct
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Slide 43 266 g Copper(I) sulfide can be produced from sulfur and metallic copper via the reaction: 16 Cu(s) + S 8 (s) 8 Cu 2 S(s) M(Cu) = 63.5 M(Cu 2 S ) = 159.2 If the percent yield for this reaction is 60%, how many grams of Cu are required to react with an excess of sulfur to produce 200 grams of Cu 2 S?
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Fundamentals of Solution Stoichiometry Slide 44 We will defer covering this section (Sect. 3.5) until after we have covered solution phase reactions (precipitation, acid-base, and redox) in Chapter 4.
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