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 61 · Normal
Question 11
3 marks · Normal
Answer and see the solution →Calculate the volume, in cm³, of 0.45 mol of helium gas at rtp. Show your working.
Question 12
4 marks · Normal
Answer and see the solution →The table shows the number of moles of different gases measured at rtp in a laboratory.
Number of moles of gases at rtp Gas Moles Oxygen 0.25 Neon 0.50 Argon 1.00 (a)[2 marks]For each gas, state the volume it would occupy at rtp in dm³.
(b)[1 mark]What is the volume in cm³ of 0.50 mol of neon gas at rtp?
(c)[1 mark]Explain why 1.00 mol of argon and 1.00 mol of oxygen have the same volume at rtp.
Question 13
1 mark · Normal
Answer and check →What is the volume, in dm³, of 0.75 mol nitrogen gas at rtp?
- A.18 dm³
- B.24 dm³
- C.32 dm³
- D.0.75 dm³
Question 14
2 marks · Normal
Answer and see the solution →You measured a gas volume as 500 cm³. Convert it into dm³ and explain how you did the conversion.
Question 15
4 marks · Normal
Answer and see the solution →Answer the following questions about the volume of gases at rtp.
(a)[1 mark]What is meant by the term 'molar volume'?
(b)[1 mark]State the molar volume at room temperature and pressure in dm³ and in cm³.
(c)[2 marks]A student says the molar volume of oxygen is different from that of carbon dioxide at rtp. Explain whether this statement is correct.
Question 16
3 marks · Normal
Answer and see the solution →A student wants to find out whether the volume given for a gas in a chemistry problem should be recorded in cm³ or dm³. They know that 1 dm³ is equal to 1000 cm³.
Explain which unit (cm³ or dm³) is more suitable for measuring the volume of a sample of air collected from a 3-litre container, and describe how to convert between these units.
Question 17
2 marks · Normal
Answer and see the solution →Calculate the volume, in cm³, of 0.16 g of oxygen gas (O₂) at room temperature and pressure. (Ar: O = 16; molar volume = 24,000 cm³ at rtp)
Question 18
4 marks · Normal
Answer and see the solution →Hydrochloric acid reacts with sodium carbonate to produce sodium chloride, carbon dioxide and water. The balanced equation is:
(a)[2 marks]Calculate the number of moles in 1.06 g of sodium carbonate. (Ar: Na = 23, C = 12, O = 16)
(b)[2 marks]Calculate the volume, in dm³, of carbon dioxide produced at rtp by this mass of sodium carbonate. (Molar volume at rtp = 24 dm³)
Question 19
3 marks · Normal
Answer and see the solution →Calculate the number of moles in 360 cm³ of nitrogen gas at room temperature and pressure. Give your answer to two decimal places. (Molar volume = 24,000 cm³ at rtp)
Question 20
3 marks · Normal
Answer and see the solution →A student needs to calculate the mass of carbon dioxide produced when 48,000 cm³ of carbon dioxide is collected at room temperature and pressure. Explain the steps, including the formulae needed, to calculate the mass of carbon dioxide produced. (Ar: C = 12, O = 16; molar volume = 24,000 cm³ at rtp)