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S1.4 Counting particles by mass: The mole - IB Questionbank | RevisionDojo

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.

Paper

Level

Question 1

SL & HLPaper 1A

A gas has a density of 1.25 $\text{g dm}^{-3}$ at 298 K and 100 kPa. What is its molar mass?

Question 2

SL & HLPaper 1A

A compound has a molar mass of $180.0\ \mathrm{g\,mol^{-1}}$ and empirical formula $\mathrm{CH_2O}$ . What is its molecular formula?

Question 3

SL & HLPaper 1A

A compound contains 0.10 mol of hydrogen, 0.05 mol of carbon, and 0.025 mol of nitrogen. What is the empirical formula?

Question 4

SLPaper 1A

What is the amount, in mol, of $2.0 \text{ g}$ of sodium hydroxide, NaOH?

(Relative atomic masses: $\text{H} = 1.01$ , $\text{O} = 16.00$ , $\text{Na} = 22.99$ )

Question 5

SLPaper 1A

Which amount, in mol, of potassium chloride is needed to make $250 \text{ cm}^3$ of $0.10 \text{ mol dm}^{-3}$ solution?

Question 6

SL & HLPaper 1A

How many oxygen atoms are present in 0.250 mol of $\mathrm{Al}_2(\mathrm{SO}_4)_3$ ?

Question 7

SL & HLPaper 1A

A $25.0 \text{ cm}^3$ sample of gas at $100 \text{ kPa}$ and $298 \text{ K}$ has a mass of $0.0650 \text{ g}$ . What is the molar mass of the gas?

Question 8

SL & HLPaper 1A

How many moles are in 18.0 g of water ( $\mathrm{H_2O}$ )?

Question 9

SLPaper 1A

Which sample contains the fewest moles of HCl?

$N_A = 6.02 \times 10^{23} \, \text{mol}^{-1}.$

Molar volume of an ideal gas at STP $= 22.7 \, \text{dm}^3 \text{ mol}^{-1}$ .

Question 10

SL & HLPaper 1A

What is the amount in moles of $4.00 \text{ g}$ of hydrogen gas ( $\text{H}_2$ )?

Paper

Level

Question 1

SL & HLPaper 1A

A gas has a density of 1.25 $\text{g dm}^{-3}$ at 298 K and 100 kPa. What is its molar mass?

Question 2

SL & HLPaper 1A

A compound has a molar mass of $180.0\ \mathrm{g\,mol^{-1}}$ and empirical formula $\mathrm{CH_2O}$ . What is its molecular formula?

Question 3

SL & HLPaper 1A

A compound contains 0.10 mol of hydrogen, 0.05 mol of carbon, and 0.025 mol of nitrogen. What is the empirical formula?

Question 4

SLPaper 1A

What is the amount, in mol, of $2.0 \text{ g}$ of sodium hydroxide, NaOH?

(Relative atomic masses: $\text{H} = 1.01$ , $\text{O} = 16.00$ , $\text{Na} = 22.99$ )

Question 5

SLPaper 1A

Which amount, in mol, of potassium chloride is needed to make $250 \text{ cm}^3$ of $0.10 \text{ mol dm}^{-3}$ solution?

Question 6

SL & HLPaper 1A

How many oxygen atoms are present in 0.250 mol of $\mathrm{Al}_2(\mathrm{SO}_4)_3$ ?

Question 7

SL & HLPaper 1A

A $25.0 \text{ cm}^3$ sample of gas at $100 \text{ kPa}$ and $298 \text{ K}$ has a mass of $0.0650 \text{ g}$ . What is the molar mass of the gas?

Question 8

SL & HLPaper 1A

How many moles are in 18.0 g of water ( $\mathrm{H_2O}$ )?

Question 9

SLPaper 1A

Which sample contains the fewest moles of HCl?

$N_A = 6.02 \times 10^{23} \, \text{mol}^{-1}.$

Molar volume of an ideal gas at STP $= 22.7 \, \text{dm}^3 \text{ mol}^{-1}$ .

Question 10

SL & HLPaper 1A

What is the amount in moles of $4.00 \text{ g}$ of hydrogen gas ( $\text{H}_2$ )?

Paper

Level

Question 1

SL & HLPaper 1A

A gas has a density of 1.25 $\text{g dm}^{-3}$ at 298 K and 100 kPa. What is its molar mass?

Question 2

SL & HLPaper 1A

A compound has a molar mass of $180.0\ \mathrm{g\,mol^{-1}}$ and empirical formula $\mathrm{CH_2O}$ . What is its molecular formula?

Question 3

SL & HLPaper 1A

A compound contains 0.10 mol of hydrogen, 0.05 mol of carbon, and 0.025 mol of nitrogen. What is the empirical formula?

Question 4

SLPaper 1A

What is the amount, in mol, of $2.0 \text{ g}$ of sodium hydroxide, NaOH?

(Relative atomic masses: $\text{H} = 1.01$ , $\text{O} = 16.00$ , $\text{Na} = 22.99$ )

Question 5

SLPaper 1A

Which amount, in mol, of potassium chloride is needed to make $250 \text{ cm}^3$ of $0.10 \text{ mol dm}^{-3}$ solution?

Question 6

SL & HLPaper 1A

How many oxygen atoms are present in 0.250 mol of $\mathrm{Al}_2(\mathrm{SO}_4)_3$ ?

Question 7

SL & HLPaper 1A

A $25.0 \text{ cm}^3$ sample of gas at $100 \text{ kPa}$ and $298 \text{ K}$ has a mass of $0.0650 \text{ g}$ . What is the molar mass of the gas?

Question 8

SL & HLPaper 1A

How many moles are in 18.0 g of water ( $\mathrm{H_2O}$ )?

Question 9

SLPaper 1A

Which sample contains the fewest moles of HCl?

$N_A = 6.02 \times 10^{23} \, \text{mol}^{-1}.$

Molar volume of an ideal gas at STP $= 22.7 \, \text{dm}^3 \text{ mol}^{-1}$ .

Question 10

SL & HLPaper 1A

What is the amount in moles of $4.00 \text{ g}$ of hydrogen gas ( $\text{H}_2$ )?

S1.4 Counting particles by mass: The mole Questionbank