What are the gases remaining in a jar from a charcoal?

When charcoal is burned, it primarily produces carbon dioxide (CO2) and water vapor (H2O) as byproducts of combustion. However, if the combustion is incomplete, other gases such as carbon monoxide (CO) and various volatile organic compounds (VOCs) may also be present in the jar. Additionally, if the charcoal has impurities or additives, those can contribute to the gas composition as well. Overall, the remaining gases will largely depend on the combustion conditions and the type of charcoal used.