RPA Finding molar volume of a gas

Question 1

Avogadro’s Law

Answer 1

Equal volumes of gases at the same temperature and [pressure will contain an equal number of molecules

Question 2

How can you measure the volume of gas released from a reaction

Answer 2

Using a gas syringe connected to a bung via a tube, which stops the conical flask containing the reactants

Question 3

What is the weighing by different method

Answer 3

Used to weigh materials accurately

Mass of substance= mass of dish and substance - mass of dish after substance has been transferred

Question 4

How would you carry out an experiment to measure the molar volume of a gas?

Answer 4

React ethanoic acid and solid calcium carbonate together

Using a gas syringe and measure the volume of gas released

Repeat for increasing masses of CaCO3

Question 5

What are some issues with this experiment

Answer 5

Some gas may escape before the bung is added
A solid reactant may be of different mass, surface area etc, for each repeat which will affect the rate of reaction
CO2 is slightly soluble in water, so the exact volume is not measured as some dissolve in solution

Question 6

How do you prevent gas escaping

Answer 6

Place the solid reactant upright inside a sample tube in the conical flask, tipping the tube over by moving the conical flask around to start the reaction

Question 7

How would you analyse this data

Answer 7

Plot a graph of mass of CaCO3 (x) against volume of CO2 collected (y)
Draw a line of best fit through the origin
In this reaction CaCO3:CO2 in 1:1 ratio
Could calculate the number of moles in CaCO3 in 0.25g and use this to calculate the volume of 1 mol of CO2 in dm3