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IB Chemistry 1.5 Ideal gases Questions

IB Chemistry 1.5 Ideal gases Questions
IB Chemistry syllabusChemistry SL/HLFirst assessment 2025

Learn to calculate and predict gas behaviour by reading P-V graphs, comparing temperature changes in Kelvin, and explaining why real gases deviate.

Exam points

  • interpret inverse P-V graphs and predict how pressure changes when volume is doubled at constant temperature
  • calculate gas amount with pV = nRT and convert conditions such as 200 degrees C to 473 K before substitution
  • explain why NO deviates more than N2 by comparing polar NO with non-polar N2 and stronger intermolecular forces

Question 1

[Maximum number: 5]

Nitrogen monoxide, NO(g), is produced in internal combustion and jet engines.

Question 1(b)

(a)

Calculate the amount, in moles, of NO in 1.0×10−3 m31.0 \times 10^{-3} \mathrm{~m}^{3} of engine exhaust gas which contains 0.10 % NO by volume at 200∘C200^{\circ} \mathrm{C} and 1.0×105 Pa1.0 \times 10^{5} \mathrm{~Pa}.

Use sections 1 and 2 of the data booklet.

[ 3 ]

Question 1(c)

(b)

Outline why NO deviates more than nitrogen, N2\mathrm{N}_{2}, from the ideal gas model.

[ 2 ]

Question 1(b)

[Maximum number: 3]

Nitrogen monoxide, NO(g), is produced in internal combustion and jet engines.

Calculate the amount, in moles, of NO in 1.0×10−3 m31.0 \times 10^{-3} \mathrm{~m}^{3} of engine exhaust gas which contains 0.10 % NO by volume at 200∘C200^{\circ} \mathrm{C} and 1.0×105 Pa1.0 \times 10^{5} \mathrm{~Pa}.

Use sections 1 and 2 of the data booklet.

Question 5

[Maximum number: 1]

A fixed volume of an ideal gas, initially at 30∘C30^{\circ} \mathrm{C} and with a pressure of P Pa\mathbf{P ~ P a}, was heated to 60∘C60^{\circ} \mathrm{C}. What is the resulting pressure in Pa ?

A

Half of P

B

A little less than P

C

A little more than P

D

Two times P

Question 5

[Maximum number: 1]

A fixed volume of an ideal gas, initially at 30∘C30^{\circ} \mathrm{C} and with a pressure of P Pa\mathbf{P ~ P a}, was heated to 60∘C60^{\circ} \mathrm{C}. What is the resulting pressure in Pa ?

A

Half of P

B

A little less than P

C

A little more than P

D

Two times P

Question 5

[Maximum number: 1]

In which of the following sets of conditions does the gas exhibit behaviour closest to an ideal gas ?

Gas

Pressure / kPa

Temperature / K

H2\mathrm{H}_{2}

100

273

NH3\mathrm{NH}_{3}

50

473

H2\mathrm{H}_{2}

50

473

NH3\mathrm{NH}_{3}

100

273

Question 17

[Maximum number: 1]

The volume of a container filled with a fixed amount of gas is increased by 100 % at constant temperature. How does this affect the pressure in a container? p V=n R T

A

Pressure increases by 100 %

B

Pressure decreases by 100 %

C

Pressure increase by 50 %

D

Pressure decreases by 50 %

Question 5(b)(i)

[Maximum number: 2]

An unknown organic compound contains only carbon, hydrogen and oxygen.

The same organic compound was vaporized completely at a controlled temperature and pressure.

0.108 g of the vaporized compound was found to have a volume of 55.7 cm355.7 \mathrm{~cm}^{3} at 100∘C100^{\circ} \mathrm{C} and a pressure of 1.00×105 Pa1.00 \times 10^{5} \mathrm{~Pa}.
Calculate the amount, in moles, of the compound. Use sections 1, 2 and 4 of the data booklet.

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