Neco Model Questions Vol1 2025 Chemistry Question 3
Practice objective / multiple choice question 3 from the 2025 Neco Model Questions Vol1 Chemistry examination.
In the diagram of a gas‑collection‑over‑water apparatus, a gas is collected at a volume of \(250.0\ \text{mL}\) at \(25.0^{\circ}\text{C}\). The barometric pressure is \(760\ \text{mmHg}\) and the vapour pressure of water at this temperature is \(23.8\ \text{mmHg}\). After drying, the gas volume is measured as \(242.0\ \text{mL}\) at \(1.00\ \text{atm}\) and \(298\ \text{K}\). Determine the number of moles of the original gas collected over water.
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About This Question
This is Neco Model Questions Vol1 2025 Chemistry Question 3. It is one of the objective questions from the 2025 Neco Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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