gas
hi! this question actually puzzles me. the "the same conditions" of course mean the same temperature, same pressure, etc. So the only thing that changed here is the volume. Is the container rigid or elastic? Is it a solid cylinder or a balloon? Because these variables (volume, pressure, temperature) are inter-related. One variable influences the other. Say, if pressure is increased, volume decreases. Now, if the container where the conversion of NO2 to N2O4 occurs is something rigid and closed, would the volume not stay the same? The gases take the volumes of their containers right?
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