Zinc reacts with aqueous sulfuric acid to form hydrogen gas: Zn (s) + H₂SO₄ (aq) → ZnSO₄ (aq) + H₂ (g)
In an experiment, 201 mL of wet H₂ is collected over water at 27°C and a barometric pressure of 733 torr. The vapor pressure of water at 27°C is 26.74 torr. The partial pressure of hydrogen in this experiment is __________ atm.

Question

Quizplus · Accepted Answer

The partial pressure of hydrogen is equal to the total pressure minus the vapor pressure of water. The total pressure is 733 torr, and the vapor pressure of water is 26.74 torr. Therefore, the partial pressure of hydrogen is 733 torr - 26.74 torr = 706.26 torr. Converting to atm, we get 706.26 torr * (1 atm / 760 torr) = 0.929 atm.

Zinc Reacts with Aqueous Sulfuric Acid to Form Hydrogen Gas