Hydrogen Gas Produced in the Laboratory by the Reaction of Zinc

question 95

Multiple Choice

Hydrogen gas produced in the laboratory by the reaction of zinc and hydrochloric acid was collected over water at 25°C.The barometric pressure at the time was 742.5 mm Hg.What is the pressure of dry hydrogen gas if the vapor pressure of water at 25°C is 23.8 mm Hg?

• A)742.5 mm Hg
• B)718.7 mm Hg
• C)766.3 mm Hg
• D)760.0 mm Hg
• E)none of the above

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