Match List-I with List-II. List-I Mass of substance List-II Number of atoms A. 1.8 mg water I. 2 10⁻⁴ N_A B. 9.8 mg sulphuric acid II. 1.5 10⁻⁴ N_A C. 1.8 mg carbon III. 3 10⁻⁴ N_A D. 5.85 mg salt (NaCl) IV. 7 10⁻⁴ N_A Choose the correct answer from the options given below:

Step-by-step solution

For A: Molar mass of H₂O = 18 g/mol. Moles of H₂O = 1.8 10⁻³ 18 = 10⁻⁴ . Since each H₂O molecule has 3 atoms, the number of atoms = 3 10⁻⁴ N_A . For B: Molar mass of H₂SO₄ = 98 g/mol. Moles of H₂SO₄ = 9.8 10⁻³ 98 = 10⁻⁴ . Since each H₂SO₄ molecule has 7 atoms, the number of atoms = 7 10⁻⁴ N_A . For C: Molar mass of C = 12 g/mol. Moles of C = 1.8 10⁻³ 12 = 1.5 10⁻⁴ . The number of atoms = 1.5 10⁻⁴ N_A . For D: Molar mass of NaCl = 58.5 g/mol. Moles of NaCl = 5.85 10⁻³ 58.5 = 10⁻⁴ . Since each NaCl formula unit has 2