Chemistry 1st year Actual yield theoretical yield Percentage yield

2. Prof. Sohaib Hasnain
Punjab Group of Colleges, Faisalabad
CHEMISTRY

3. YIELD

4. “THE AMOUNT OF PRODUCT
OBTAINED IN A CHEMICAL
REACTION”

5. YIELD
Actual
Yield
Percentage
yield
Theoretical
yield

6. THEORETICAL YIELD
“THE AMOUNT OF THE PRODUCT
CALCULATED FROM THE BALANCED
CHEMICAL EQUATION”
C + O2 → CO2
12g 32g 44g

7. 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

8. ACTUAL YIELD
“THE AMOUNT OF THE PRODUCT
OBTAINED WITH THE GIVEN AMOUNT OF
REACTANT IN AACTUAL EXPERIMENT”

9. 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

10. 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

11. 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

12. 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

13. EFFICIENCY OF A CHEMICAL
REACTION IS CALCULATED
FROM PERCENTAGE YIELD

14. HOW CAN WE CALCULATE
%AGE YIELD
We should know about the actual and theoretical yield
Percentage yield =
𝑨𝒄𝒕𝒖𝒂𝒍 𝒚𝒊𝒆𝒍𝒅
𝑻𝒉𝒆𝒐𝒓𝒓𝒕𝒊𝒄𝒂𝒍 𝒚𝒊𝒆𝒍𝒅
× 100

15. 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

16. 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