Percent Yield in Reactions CBHS Hoepage在反应率外切酶主页.pptVIP

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Percent Yield in Reactions CBHS Hoepage在反应率外切酶主页.ppt

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Percent Yield in Reactions CBHS Hoepage在反应率外切酶主页

Percent Yield in Reactions Welcome to The Real World Ideal Conditions All reactants actually react. No outside influences exist. People don’t screw things up. There are no acts of nature. Dream on. For whatever reason Nothing happens in a vacuum No chemical reaction is perfect Usually a fraction of the expected yield is produced Theoretical yield: What the calculation says we should get Actual yield: What is really produced. Percentage Yield = Actual yield/theoretical yield x 100 Example 1 A student conducts a single displacement reaction that produces 2.755 grams of copper.? Mathematically he determines that 3.150 grams of copper should have been produced.? Calculate the students percentage yield. Solve:actual amount of product: 2.755 gexpected amount of product: 3.150 g Example 1 continued ???????????????????? actual amount of productpercentage yield = ------------------------------------------- x 100?????????????????????????? expected amount of product?? ??????????????????? 2.755gpercentage yield = --------------- x 100?????????????????????????? 3.150g?? percentage yield = 87.4603174 % percentage yield = 87.46 % Example 2 Solid sodium nitrate decomposes to form solid sodium nitrite and oxygen gas 2NaNO3 ? 2NaNO2 + O2 If the percentage yield is 80.4%, how much sodium nitrite will be produced from 955g of NaNO3? Solution Divide by molar mass of NaNO3 Multiply by the coefficient ratio Multiply by molar mass of NaNO2 Multiply by percentage yield \\admin2000\facultysettings$\dsandberg\documents\Example problem 2 percent yield.doc Assignment Percentage Yield Problem Set * *