Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Using the molar volume in calculations with chemical equations
19 practice questions
Practice questions
1–8 of 8 · Easy
Question 1
1 mark · Easy
Answer and see the solution →State the molar volume of a gas, in dm³, at room temperature and pressure.
Question 2
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.
Question 3
2 marks · Easy
Answer and see the solution →Calculate the number of moles of helium gas in a 12 dm³ container at room temperature and pressure.
Question 4
2 marks · Easy
Answer and see the solution →Explain why the volume of gas collected must be converted to dm³ before using the molar volume of 24 dm³ in calculations.
Question 5
3 marks · Easy
Answer and see the solution →The table shows the volume of a gas produced from the reaction of different masses of magnesium with excess hydrochloric acid at room temperature and pressure.
Mass of magnesium (g) Volume of H₂ gas (dm³) 0.12 0.12 0.24 0.24 0.36 0.36 (a)[1 mark]Describe the relationship between the mass of magnesium and the volume of hydrogen gas produced.
(b)[1 mark]Suggest the volume of hydrogen gas (in dm³) produced from 0.48 g of magnesium.
(c)[1 mark]Explain your answer to part (b).
Question 6
1 mark · Easy
Answer and see the solution →Write the formula relating number of moles, volume of gas (in dm³), and molar volume at room temperature and pressure.
Question 7
3 marks · Easy
Answer and see the solution →(a)Potassium reacts with water to produce potassium hydroxide and hydrogen gas according to:
If 4.6 g of potassium (Ar: K = 39) reacts completely, calculate:
(i)[1 mark]the number of moles of potassium reacted.
(ii)[1 mark]the number of moles of hydrogen gas formed.
(iii)[1 mark]the volume of hydrogen gas produced at rtp (in dm³).
Question 8
2 marks · Easy
Answer and see the solution →Calculate the volume in cm³ of 0.015 mol of nitrogen gas at room temperature and pressure.