Calculate solute mass using moles × molar mass, where moles = concentration × volume (in dm³) Steps: - Convert volumes to dm³: A = 0.1, B = 0.5, C = 1.0, D = 2.0. - Compute moles: A = 1.0 × 0.1 = 0.1; B = 0.5 × 0.5 = 0.25; C = 0.1 × 1.0 = 0.1; D = 0.05 × 2.0 = 0.1. - Use molar masses (g/mol): NaOH = 40, H₂SO₄ = 98, KOH = 56, HCl = 36.5. - Compute masses (g): A = 0.1 × 40 = 4; B = 0.25 × 98 = 24.5; C = 0.1 × 56 = 5.6; D = 0.1 × 36.5 = 3.65. Why B is correct: - B yields the highest mass (24.5 g) due to more moles (0.25) combined with high molar mass (98 g/mol), per the formula mass = n × M. Why the others are wrong: - A: Fewer moles and lower molar mass give only 4 g. - C: Same moles as A/D but moderate molar mass gives 5.6 g, less than B. - …