Final answer:
Without the initial volume of the gas at 20°C, we cannot calculate the final temperature after expansion to 0.700 m³ in an isobaric process using the available information.
Step-by-step explanation:
The subject of this question is Physics, specifically concerning the concept of gas laws and temperature change under isobaric (constant-pressure) conditions. Without knowing the initial volume of the gas at 20°C, it's impossible to calculate the final temperature after the expansion to 0.700 m³ under constant pressure directly from the information provided. However, if Exercise 23 contains that initial volume, one would use Charles's Law (V1/T1 = V2/T2, where volumes are in m³ and temperatures in Kelvin) to find the final temperature. Since the student's question does not provide an initial volume or the text of Exercise 23, we cannot provide a numeric answer here.