Final answer:
The question pertains to Charles's law and the change in gas volume with temperature. The provided information is insufficient to verify the exact volume change to 6.84 L at 350 °C without performing the necessary calculations, but it indicates a volume increase proportional to temperature in Kelvin.
Step-by-step explanation:
The question addresses the concept of gas volume change with temperature, which is described by Charles's law. According to Charles's law, at constant pressure, the volume of a gas is directly proportional to its temperature measured in Kelvin. Hence, when the temperature of a gas increases, its volume also increases. The initial statement given, stating that a gas occupies 3.00 L at standard temperature and then occupies 6.84 L at 350 °C, is possibly true depending upon the actual calculations following Charles's law. However, based on the reference information provided, which indicates that the volume increases from 0.300 L to 0.321 L when the temperature is increased from 283 K to 303 K, the volume doubling from 3.00 L to 6.84 L at 350 °C cannot be directly assessed without doing the proper calculations at the specific temperatures.