Gce Model Questions Vol1 2017 Physics Question 40

A sealed rigid container initially contains dry air at a pressure of \(150\ \text{kPa}\) and a temperature of \(20^{\circ}\text{C}\). Its volume is \(5.0\ \text{L}\). The container is then heated to \(80^{\circ}\text{C}\) and allowed to expand freely until its volume becomes \(6.0\ \text{L}\). (a) Assuming ideal‑gas behaviour, calculate the final absolute pressure of the air in the container. (b) The container is subsequently opened to the atmosphere (\(101.3\ \text{kPa}\)) while remaining at \(80^{\circ}\text{C}\). How many grams of air escape from the container? (Molar mass of air = \(28.97\ \text{g·mol}^{-1}\)). Give the final pressure to one decimal place and the mass escaped to two significant figures.