Considere que uma análise termogravimétrica tenha sido realizada utilizando 10 mg de amostra, a uma temperatura inicial de 25 ºC, com uma taxa de aquecimento de 5 ºC/min em fluxo de 10 mL/min de gás argônio. A análise foi realizada por um período de 2 h e 30 min. Assim, a temperatura em que a análise foi finalizada é de

First, let's analyze the given information:

• The sample mass is 10 mg.
• The initial temperature is 25°C.
• The heating rate is 5°C/min.
• The gas flow rate is 10 mL/min of argon.
• The analysis duration is 2 hours and 30 minutes.

Now, let's calculate the final temperature:

Heating rate (5°C/min) × Analysis duration (2 hours 30 minutes) = 5°C/min × 150 minutes = 750°C.

Since the initial temperature is 25°C, we add it to the calculated temperature:

Final temperature = 25°C + 750°C = 775°C.

Therefore, the correct answer is alternative C) 775°C.

Explanation: The key to solving this problem is to understand the concept of heating rate and its relation to the analysis duration. By multiplying the heating rate by the analysis duration, we can calculate the total temperature increase. Then, by adding the initial temperature, we obtain the final temperature, which is 775°C in this case.