Question

Aniline (9.3 g) on reaction with acetic anhydride forms X (11 g). Find the percentage yield of the reaction.

• A. 82
• B. 90
• C. 81.48
• D. 93.2

Hint:

Percentage yield compares actual product obtained with the maximum possible product.

Answer 1

The Correct Option is C

Step 1: Write the reaction.
Aniline reacts with acetic anhydride to form acetanilide:
\[ C_6H_5NH_2 \xrightarrow{(CH_3CO)_2O} C_6H_5NHCOCH_3 \]
Step 2: Calculate moles of aniline used.
Molar mass of aniline = 93 g/mol
\[ \text{Moles of aniline} = \frac{9.3}{93} = 0.1 \]
Step 3: Calculate moles of product formed.
Molar mass of acetanilide = 135 g/mol
\[ \text{Moles of acetanilide} = \frac{11}{135} = 0.08148 \]
Step 4: Calculate percentage yield.
\[ %\ \text{Yield} = \frac{\text{Actual yield}}{\text{Theoretical yield}} \times 100 \] \[ = \frac{0.08148}{0.1} \times 100 = 81.48% \]