Final answer:
To calculate the percentage yield, you need to divide the actual yield by the theoretical yield and multiply by 100%.
Step-by-step explanation:
The percentage yield can be calculated using the formula:
Percentage Yield = (Actual Yield / Theoretical Yield) x 100%
In this case, the actual yield of bromobenzene is given as 49.1 g. The percentage yield can be calculated as:
Percentage Yield = (49.1 g / Theoretical Yield) x 100%
Since the theoretical yield is not provided, it is not possible to determine the exact percentage yield.