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
31–40 of 144
Question 31
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 32
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 33
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 34
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 35
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 36
2 marks · Hard
Answer and see the solution →State the volume, in dm³ and in cm³, that 1 mole of a gas would occupy at room temperature and pressure (rtp).
Question 37
5 marks · Hard
Answer and see the solution →A student reacts zinc with dilute hydrochloric acid to produce hydrogen gas at room temperature and pressure (rtp), according to the equation:
The student collects exactly 0.85 mol of hydrogen gas.
(a)[2 marks]Calculate the volume, in dm³, of 0.85 mol of hydrogen gas at rtp. Show your working.
(b)[1 mark]Convert your answer from part (a) into cm³.
(c)[2 marks]Explain why a different gas produced under the same conditions and with the same number of moles would occupy the same volume.
Question 38
2 marks · Hard
Answer and see the solution →A laboratory sample has a measured volume of 0.275 dm³. Convert this volume to cm³, showing your working.
Question 39
1 mark · Easy
Answer and see the solution →State the molar volume of a gas, in dm³, at room temperature and pressure.
Question 40
3 marks · Easy
Answer and see the solution →(a)To prepare hydrogen in the laboratory, zinc reacts with excess dilute sulfuric acid according to this equation:
A student adds 13.0 g of zinc (Ar: Zn = 65) to excess sulfuric acid.
(i)[1 mark]Calculate the number of moles of zinc used.
(ii)[1 mark]State the number of moles of hydrogen gas produced.
(iii)[1 mark]Calculate the volume, in dm³, of hydrogen gas produced at room temperature and pressure.