ARE U READY FOR SOME PERCENT YIELD?! (:

 

DO U GET IT ?? ( cas i dont hahah)

now MOVING ON.

are u ready?

so lets start by knowing the basics.

what is the formula of percent yeild?

|  hmmmmmm? (: |

 

 percent yield: is the ratio of # of product obtained to # of product expected by calculation, expressed as %.

Here's an example:

Q: What is the % yield of water if 138 g H2O is produced from 16g H2 and excess O2?

STEP 1: Write the balanced chemical equation

2H2 + O2 ---> 2H2O

STEP 2: Determine the actual and theoretical yield. Actual is given and theoretical is calculated.

#g H2O = 16g H2 x 1 mol H2 x  2 mole H2O x 18.02 H2O = 143 g

                      2.02 g H2    2 mole H2    1 mol H2O   

STEP 3: Calculate percent yield.

13g H2O      x 100% = 96.

143 g H2O            

 [ dont forget your sig figs guys! ]

need more practice??

Percent Yield Practice Problems

1.  A student adds 200.0g of C₇H₆O₃ to an excess of C₄H₆O₃, this produces C₉H₈O₄ and C₂H₄O₂.  Calculate the percent yield if 231 g of aspirin (C₉H₈O₄) is produced.

            C₇H₆O₃   +   C₄H₆O₃   à    C₉H₈O₄ +   C₂H₄O₂

2.  According to the following equation, Calculate the percentage yield if 550.0 g of toluene ()added to an excess of nitric acid () provides 305 g of the p-nitrotoluene product.

            C₇H₈  +  HNO₃  à  C₇H₇NO₂   =   H₂O

3.  Quicklime, CaO, can be prepared by roasting limestone, CaCO₃, according to the chemical equation below.  When 2.00 x 10³ g of CaCO₃ are heated, the actual yield of CaO is 1.50 x 10³ g.  What is the percentage yield?

            CaCO₃   à   CaO   +   CO₂

Answers:

1.  ≈90%

2. 37.2%

3. 93.8%

U CAN ALSO VISIT: 

http://www.fordhamprep.org/gcurran/sho/sho/lessons/lesson166.htm 

SOMETHING YOU CAN WATCH:

http://www.youtube.com/watch?v=TKNxdL7DN1I&feature=player_embedded
http://www.youtube.com/watch?v=lDvTIgUi56I&feature=player_embedded
http://www.youtube.com/watch?v=UZsfANe1ayI&feature=player_embedded
http://www.youtube.com/watch?v=_tZm03nnWrA&feature=player_embedded
http://www.youtube.com/watch?v=ClTbd0qTdWw&feature=player_embedded

^ ALL OF THOSE VIDS CAN BE FOUND IN ONE WEBSITE. HOW NICE IS THAT?
JUST CLICK HERE. EASY AS THAT. YOUR WELCOME AND ENJOY (:

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JOKE OF THE DAY! (:

Q: If H₂O is the formula for water, what is the formula for ice?
A: H₂O cubed.

HA-HA-HA
Im so funny.