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Calculate the volume occupied by 0.5 moles of oxygen gas (O₂) at room temperature and pressure (RTP). (Molar volume = 24 dm³/mol)

Calculate the number of moles of magnesium in 2.4 g of Mg. (Ar: Mg = 24) [2] igcse chemistry past paper

How many moles are present in 36 g of water (H₂O)? (Ar: H = 1, O = 16) Calculate the volume occupied by 0

A) 6 dm³ B) 12 dm³ C) 24 dm³ D) 48 dm³ 1 mark for volume)

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)