(1) (a) Two glass flasks, flask A and flask B, are connected by a closed tap. Flask A contains 0.550 g of neon at 25 C and 1.0 atm. There is a vacuum in flask B. (1) What is the volume of flask A? (3 marks) (ii) The volume of flask B is 0.25 dm'. When the tap between the two flasks is opened, the total pressure in both flasks is 0.7 atm. What is the temperature change when the tap between the flasks is opened? (3 marks) (b) An unknown gas effuses through a pinhole at a rate of 2.56 cms. Helium diffuses through the same pinhole under the same conditions at a rate of 8.49 cms! (1) What is the molar mass of the unknown gas? (3 marks) (ii) If the temperature of the unknown gas were decreased, explain what would happen to the rate of effusion. (2 marks) (c) A weather balloon filled with an ideal gas has a volume of 60 dm at 101 kPa and 23 C. (i) What is the volume of the balloon once it has risen to an altitude where the temperature is -5 C and the pressure is 6.7 kPa? (3 marks) () What is the amount of gas present in the balloon? (2 marks) (i) If the weather balloon were filled with the same amount of a non-ideal gas with strong attractive intermolecular forces under identical conditions of temperature and pressure, would the volume of the balloon be greater, smaller, or the same as the balloon filled with the ideal gas? Explain your answer. (3 marks) (d) A mixture of gases at a total pressure of 7.5 x 10^ N m2 contains 40 % N2, 35 % O2 and 25 % CO2 (1) What is the partial pressure of each gas? State which laws or hypotheses are used in your answer. (3 marks) (i) What would the partial pressures and mole fractions of Nz and O2 be if the CO2 were removed completely by the introduction of sodium hydroxide pellets? adal