Gaseous products in a closed vessel will generate pressure if not relieved.

Gaseous products in a closed vessel will generate pressure if not relieved.

• A. True
• B. False
• C. Depends on conditions
• D. Not necessarily

Answer: (A)

When gaseous products form inside a closed vessel, the pressure tends to rise because there is nowhere for the gas to escape and the volume is effectively fixed. As the reaction generates more gas (more moles) or raises the temperature, collisions of gas molecules with the container walls increase, increasing pressure. Only if the gas could vent, or the vessel could expand, or the reaction consumed the gas would the pressure stay the same or drop. In a truly closed, non-relieving system, gas generation will generate pressure.

When gaseous products form inside a closed vessel, the pressure tends to rise because there is nowhere for the gas to escape and the volume is effectively fixed. As the reaction generates more gas (more moles) or raises the temperature, collisions of gas molecules with the container walls increase, increasing pressure. Only if the gas could vent, or the vessel could expand, or the reaction consumed the gas would the pressure stay the same or drop. In a truly closed, non-relieving system, gas generation will generate pressure.