Neco 2019 Chemistry Question 26
Practice objective / multiple choice question 26 from the 2019 Neco Chemistry examination.
An equimolar mixture of n‑pentane (boiling point 36 °C) and 2‑methylbutane (boiling point 28 °C) is weighed (10.0 g). At 30 °C the total vapour pressure of the mixture is measured to be \(0.45\ \text{atm}\). The vapour pressure of pure 2‑methylbutane at 30 °C is \(0.55\ \text{atm}\) and that of pure n‑pentane at the same temperature is \(0.20\ \text{atm}\). Assuming ideal behaviour and that Raoult's law applies, calculate the mass percent of 2‑methylbutane in the original mixture.
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About This Question
This is Neco 2019 Chemistry Question 26. It is one of the objective questions from the 2019 Neco Chemistry examination.
Difficulty level: Medium .
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