Final answer:
The final temperature of the isolated system placed on top of a Bunsen burner for an hour is 35°C.
Step-by-step explanation:
To find the final temperature of the isolated system after being placed on top of a Bunsen burner for an hour, we can use the principle of heat transfer. The initial temperature of the system is 30°C, and the Bunsen burner has a temperature of 70°C. The heat from the burner will transfer to the system until it reaches equilibrium.
In this case, since the Bunsen burner is at a higher temperature, heat will flow from the burner to the system. As a result, the final temperature of the system will be higher than 30°C but lower than 70°C. So, the correct answer is (b) 35°C.