What happens to sulfuric acid in combustion gases?

Sulfuric acid, when present in combustion gases, undergoes a conversion process where, under high temperatures, it can dissociate and form sulfur trioxide (SO3). This transformation occurs because sulfuric acid (H2SO4) is composed of sulfate ions, which can be broken down into sulfur oxides during combustion. The formation of sulfur trioxide can contribute to the creation of sulfurous compounds in combustion emissions.

Understanding this process is significant, as sulfur trioxide can further react with water vapor to form additional sulfuric acid, potentially leading to acid rain if these emissions are released into the atmosphere. This highlights the importance of managing and reducing sulfur emissions in combustion systems to mitigate environmental impacts. The other options do not accurately reflect the chemical behavior of sulfuric acid during combustion, emphasizing the key role of sulfur compounds in the broader context of emissions and combustion chemistry.