Created by StemPy LabAn element X forms a volatile chloride that contains chlorine by mass. At the same temperature and pressure, the vapour of this chloride is times as dense as hydrogen gas. The atomic mass of chlorine is . A student first takes the formula to be XCl. What is the atomic mass of X?
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← A laboratory stock of sodium chloride solution is labelled 3.00 m (molal), and its density is 1.12 g mL⁻¹. A student needs its molarity, in moles per litre of solution, to plan a dilution, and she must not confuse the two terms. Atomic masses in g mol⁻¹: Na 23, Cl 35.5. What is the molarity of the stock solution?Match each sample in List-I with the amount of oxygen atoms it contains in List-II. Atomic masses in g mol⁻¹: H 1, C 12, O 16, Al 27, S 32, Ca 40; NA = 6.022 × 10²³ mol⁻¹. List-I (Sample) A. 0.100 mol of Al₂(SO₄)₃ B. 18.0 g of glucose, C₆H₁₂O₆ C. 3.011 × 10²³ molecules of O₃ D. 10.0 g of CaCO₃ List-II (Oxygen atoms) I. 0.60 mol II. 0.30 mol III. 1.20 mol IV. 1.50 mol →
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