Using your answer from (a), calculate the volume of hydrogen gas produced at RTP. (Molar volume = 24 dm³/mol) [2]
Calculate the number of moles of magnesium in 2.4 g of Mg. (Ar: Mg = 24) [2] igcse chemistry past paper
A) 1.0 mol B) 1.5 mol C) 2.0 mol D) 2.5 mol Using your answer from (a), calculate the volume
A) 6 dm³ B) 12 dm³ C) 24 dm³ D) 48 dm³ (Ar: C = 12, O = 16) From
Exam Board: Cambridge CIE 0620 Paper: 2 – Multiple Choice (Extended) – Extract Topic: Stoichiometry & Mole Calculations Time allowed: 15 minutes (extract) Total marks: 10 Section A: Multiple Choice Questions Question 1 What is the mass of one mole of carbon dioxide (CO₂)? (Ar: C = 12, O = 16)
From equation: 1 mol Mg → 1 mol H₂ So moles H₂ = 0.10 mol Volume H₂ = 0.10 × 24 = 2.4 dm³ (1 mark for mole ratio, 1 mark for volume)
[ \text{Mg (s) + 2HCl (aq) → MgCl₂ (aq) + H₂ (g)} ]