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YIELD

  1. 1. Prof. Sohaib Hasnain Punjab Group of Colleges, Faisalabad CHEMISTRY
  2. 2. YIELD
  3. 3. “THE AMOUNT OF PRODUCT OBTAINED IN A CHEMICAL REACTION”
  4. 4. YIELD Actual Yield Percentage yield Theoretical yield
  5. 5. THEORETICAL YIELD “THE AMOUNT OF THE PRODUCT CALCULATED FROM THE BALANCED CHEMICAL EQUATION” C + O2 → CO2 12g 32g 44g
  6. 6. THEORETICAL YIELD i. It is also called calculated or expected yield ii. It gives the maximum amount of product from the reactant according to balanced chemical equation iii. It is always greater than the actual yield
  7. 7. ACTUAL YIELD “THE AMOUNT OF THE PRODUCT OBTAINED WITH THE GIVEN AMOUNT OF REACTANT IN AACTUAL EXPERIMENT”
  8. 8. ACTUAL YIELD i. It is also called experimental yield ii. It gives the less amount of product from the reactant iii. It is always less than the theoretical yield
  9. 9. DIFFERENCE B/W ACTUALAND THEORETICAL YIELD Theoretical yield Actual yield THE AMOUNT OF THE PRODUCT CALCULATED FROM THE BALANCED CHEMICAL EQUATION THE AMOUNT OF THE PRODUCT OBTAINED WHILE PERFORMING A CHEMICAL REACTION It is also called calculated or expected yield It is also called experimental yield It is always greater than the actual yield It is always less than the theoretical yield No need to perform experiment . Just to calculate from balance chemical equation In order to get actual yield experiment has to be performed
  10. 10. PERCENTAGE YIELD “IT IS EQUAL TO THE RATIO OF THE ACTUALYIELD TO THE THEORETICAL YIELD MULTIPLIED BY 100” Percentage yield = 𝐴𝑐𝑡𝑢𝑎𝑙 𝑦𝑖𝑒𝑙𝑑 𝑇ℎ𝑒𝑜𝑟𝑟𝑡𝑖𝑐𝑎𝑙 𝑦𝑖𝑒𝑙𝑑 × 100
  11. 11. WHY WE CALCULATE %AGE YIELD • It tells us how much reaction is efficient • It tells us the efficiency of reaction • It is directly related to actual yield • Greater the value of actual yield greater will be the %age yield
  12. 12. EFFICIENCY OF A CHEMICAL REACTION IS CALCULATED FROM PERCENTAGE YIELD
  13. 13. HOW CAN WE CALCULATE %AGE YIELD We should know about the actual and theoretical yield Percentage yield = 𝑨𝒄𝒕𝒖𝒂𝒍 𝒚𝒊𝒆𝒍𝒅 𝑻𝒉𝒆𝒐𝒓𝒓𝒕𝒊𝒄𝒂𝒍 𝒚𝒊𝒆𝒍𝒅 × 100
  14. 14. WHY WE CALCULATE %AGE YIELD • It tells us how much reaction is efficient • It tells us the efficiency of reaction • It is directly related to actual yield • Greater the value of actual yield greater will be the %age yield
  15. 15. WHY ACTUAL YIELD IS LESS THAN THEORETICAL YIELD  Practically inexperienced worker  Mechanical loss during experimentation such as filtration, distillation, washing, drying and crystallization if not properly carried out, decrease the yield  Side reaction  Reversible reaction  Impure reactant  Reaction condition

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