Question

After the gases are uniformly mixed, the partial pressure exerted on the walls of the vessel by the hydrogen gas is :

• A. ${\frac{1}{5}}^{th}$ of the original pressure
• B. the same as before the addition of the oxygen
• C. twice the original pressure
• D. $5$ times the original pressure
• E. $6$ times the original pressure

Answer 1

The correct option is B the same as before the addition of the oxygen

A 5 -mole sample of oxygen gas is added to a vessel that contains 1
a mole of hydrogen gas and that is maintained at a constant temperature. No chemical reaction occurs. The volume of the vessel remains unchanged.
After the gases are uniformly mixed, the partial pressure exerted on the walls of the vessel by the hydrogen gas is the same as before the addition of the oxygen.
Note: The partial pressure of a gas is directly proportional to the number of moles of the gas. Since no chemical reaction occurs, the number of moles of oxygen gas remains unchanged. Hence, the partial pressure remains unchanged.