Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Chemical Formulae, Equations and Calculations Part 2
144 practice questions
Topics covered
- Calculations involving gas volumes19 practice questions
- Calculating the volume of a certain number of moles19 practice questions
- Using the molar volume in calculations with chemical equations19 practice questions
- Concentrations of solutions19 practice questions
- Calculations with equations involving solutions19 practice questions
- The standard calculation19 practice questions
- Reversing the calculations20 practice questions
Practice questions
11–20 of 144
Question 11
3 marks · Normal
Answer and see the solution →Propane burns in oxygen according to the equation:
Calculate the total volume, in dm³, of carbon dioxide gas formed at rtp when 4.4 g of propane reacts completely. (M_r(C_3H_8) = 44)
Question 12
3 marks · Normal
Answer and see the solution →A student claims that 48 dm³ of hydrogen gas at rtp contains twice as many molecules as 24 dm³ of oxygen gas at rtp.
Is the student correct? Explain your answer.
Question 13
4 marks · Normal
Answer and see the solution →The table below shows the volume of different gases collected at rtp from several experiments.
Volumes of gases collected Experiment Gas Moles used Volume collected (dm³) 1 H₂ 0.50 12.0 2 O₂ 1.00 24.2 3 CO₂ 0.25 6.2 (a)[2 marks]Identify which experiment gave a result closest to the expected molar volume at rtp. Show your working.
(b)[2 marks]Suggest one reason why experiment 3's result is slightly higher than the expected value.
Question 14
1 mark · Normal
Answer and check →Which statement about gas volumes at rtp is correct?
- A.One mole of any gas occupies 24 dm³ at rtp.
- B.One mole of any gas occupies 22.4 dm³ at rtp.
- C.One mole of oxygen gas occupies 12 dm³ at rtp.
- D.One mole of hydrogen gas occupies 44.8 dm³ at rtp.
Question 15
2 marks · Normal
Answer and see the solution →Ammonia, NH₃, is prepared by reacting nitrogen and hydrogen as shown:
Calculate the volume (in dm³) of hydrogen at rtp needed to react completely with 10.0 dm³ of nitrogen.
Question 16
4 marks · Normal
Answer and see the solution →Magnesium reacts with steam to produce magnesium oxide and hydrogen gas as shown:
(a)[2 marks]Calculate the number of moles of hydrogen gas produced when 2.40 g of magnesium completely reacts. (M_r(Mg) = 24)
(b)[2 marks]What is the volume (in dm³ at rtp) of hydrogen gas formed?
Question 17
2 marks · Hard
Answer and see the solution →A sealed glass tube at rtp contains 0.42 moles of sulfur dioxide gas, SO₂. Calculate the volume, in dm³, of sulfur dioxide gas in the tube at rtp.
Question 18
5 marks · Hard
Answer and see the solution →Zinc reacts with dilute sulfuric acid to produce hydrogen gas according to the equation:
(a)[1 mark]State the volume, in dm³, occupied by 1 mole of hydrogen gas at rtp.
(b)[2 marks]Calculate the number of moles of hydrogen produced when 3.9 g of zinc reacts completely with excess sulfuric acid.
(Relative atomic mass: Zn = 65.)
(c)[2 marks]Calculate the volume, in dm³, of hydrogen gas produced at rtp from part (b).
Question 19
2 marks · Hard
Answer and see the solution →A sample of carbon monoxide, CO, has a volume of 6.0 dm³ at rtp. Calculate the number of moles of CO in the sample. Show your working.
Question 20
1 mark · Easy
Answer and check →What is the volume, in dm³, of 2 moles of a gas at room temperature and pressure (rtp)?