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Suppose the heaters have 25 W of power and are turned on for 15 s. What is the final volume of container B?

I found the initial pressures of both container B, I then plugged that into the initial pV=nRT to find n, then plugged that into

E=[nc(constant pressure)deltaT] using 25x15=375 J as the value for E. This determined delta T, I then plugged that (with T = delta T + 293) into the final pV=nRT to get V. This seems like it's probably too complicated, and I didn't get the right answer...can someone please help??