Question

Label each of the five statements (a – e) as True or False. Give an explanation for each of your answers. Three grams of a gas at 0°C are placed in a sealed, 10-L flask and maintained at the same temperature. The molar mass of the gas is 20 g/mol. State (true or false) whether each of the following would probably occur if the valve to the flask is opened, and explain your answers. a. The gas and air will remain separate and will not mix. b. The gas and air will mix and the gas will react with oxygen in the air. c. The gas will rush out of the bottle. d. At 0°C, the three grams of gas will still occupy 10 L. e. Air will rush into the bottle.

Answer 1

a) FALSE

Since the concentration of air is lower in the flask and that of gas is lower in atmosphere, both the gass will mix with each other to bring out the equilibrium.

b) FALSE

Since no information on the type of gas is provided, we can't really say if it will react with oxygen or not (for example noble gases) but they will definitely mix with each other.

c) False

Since gas will flow from high pressure to low pressure, pressure inside the flask is lower so it will not rush out of the bottle but since air is at higher pressure outside it will flow inside the bottle and since the volume is fixed, it will replace the gas molecules by sending them out.

d) False

Since some part of gas is escaped from the vessel volume of gas will change inside the flask at the same temperature.

e) True

Since air is at higher pressure outside and inside pressure is low, it will rush into the bottle.