Practice S1.4 Counting particles by mass: The mole with authentic IB Chemistry exam questions for both SL and HL students. This question bank mirrors Paper 1A, 1B, 2 structure, covering key topics like atomic structure, chemical reactions, and organic chemistry. Get instant solutions, detailed explanations, and build exam confidence with questions in the style of IB examiners.
A gas has a density of 1.25 at 298 K and 100 kPa. What is its molar mass?
A compound has a molar mass of and empirical formula . What is its molecular formula?
A compound contains 0.10 mol of hydrogen, 0.05 mol of carbon, and 0.025 mol of nitrogen. What is the empirical formula?
What is the amount, in mol, of of sodium hydroxide, NaOH?
(Relative atomic masses: , , )
Which amount, in mol, of potassium chloride is needed to make of solution?
How many moles are in 18.0 g of water ()?
Which sample contains the fewest moles of HCl?
Molar volume of an ideal gas at STP .
What is the amount in moles of of hydrogen gas ()?
of sodium carbonate solution, (aq), was added to a volumetric flask and the volume was made up to with water.
What is the concentration, in , of the solution?
A marine biologist studies the effect of ocean acidification on calcium carbonate shells. In the lab, she reacts powdered with excess hydrochloric acid and collects the carbon dioxide gas evolved. The reaction is:
She starts with a sample of and the gas collected has a volume of at room temperature and pressure (RTP, for gas molar volume).
Calculate the number of moles of in the sample.
Calculate the theoretical volume of that should be produced at RTP.
Determine the percentage yield of the reaction based on the volume of gas collected.
Calculate the number of molecules collected using Avogadro’s constant.
State one possible reason why the percentage yield is less than 100%.
Suggest one method the student could use to improve the accuracy of the experiment.
Practice S1.4 Counting particles by mass: The mole with authentic IB Chemistry exam questions for both SL and HL students. This question bank mirrors Paper 1A, 1B, 2 structure, covering key topics like atomic structure, chemical reactions, and organic chemistry. Get instant solutions, detailed explanations, and build exam confidence with questions in the style of IB examiners.
A gas has a density of 1.25 at 298 K and 100 kPa. What is its molar mass?
A compound has a molar mass of and empirical formula . What is its molecular formula?
A compound contains 0.10 mol of hydrogen, 0.05 mol of carbon, and 0.025 mol of nitrogen. What is the empirical formula?
What is the amount, in mol, of of sodium hydroxide, NaOH?
(Relative atomic masses: , , )
Which amount, in mol, of potassium chloride is needed to make of solution?
How many moles are in 18.0 g of water ()?
Which sample contains the fewest moles of HCl?
Molar volume of an ideal gas at STP .
What is the amount in moles of of hydrogen gas ()?
of sodium carbonate solution, (aq), was added to a volumetric flask and the volume was made up to with water.
What is the concentration, in , of the solution?
A marine biologist studies the effect of ocean acidification on calcium carbonate shells. In the lab, she reacts powdered with excess hydrochloric acid and collects the carbon dioxide gas evolved. The reaction is:
She starts with a sample of and the gas collected has a volume of at room temperature and pressure (RTP, for gas molar volume).
Calculate the number of moles of in the sample.
Calculate the theoretical volume of that should be produced at RTP.
Determine the percentage yield of the reaction based on the volume of gas collected.
Calculate the number of molecules collected using Avogadro’s constant.
State one possible reason why the percentage yield is less than 100%.
Suggest one method the student could use to improve the accuracy of the experiment.