Created by StemPy LabRead these statements about amounts of substance. Atomic masses in : H 1, C 12, N 14, O 16, Na 23, S 32, Cl 35.5, Ca 40. (i) of contains of oxygen atoms. (ii) of sodium chloride contains molecules of . (iii) of contains of ions. (iv) of and of contain equal numbers of oxygen atoms. (v) of and of contain equal numbers of molecules. How many of the statements above are correct?
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← Match each observation in List-I with the law in List-II. List-I (Observation) A. Magnesium burns in a sealed flask; the total mass is unchanged B. Black copper oxide from two sources: 1.59 g gives 1.27 g of copper, 0.795 g gives 0.635 g C. 1.00 g of sulfur takes 1.00 g of oxygen in one oxide, 1.50 g in another D. 10 mL of N₂ and 10 mL of O₂ give 20 mL of NO, at one temperature and pressure List-II (Law) I. Multiple proportions II. Conservation of mass III. Gay Lussac's law of gaseous volumes IV. Definite proportionsA 2.00 m aqueous solution of sodium hydroxide is warmed from 25 °C to 60 °C in a sealed flask, so that no water escapes. The solution expands a little on warming. Molar mass of water: 18 g mol⁻¹. Statement I: After warming, the mole fraction of NaOH in the solution is still 0.0347. Statement II: The molarity of the solution is the same at both temperatures, because no solute or solvent is lost. →
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