Created by StemPy LabA aqueous solution of sodium hydroxide is warmed from to in a sealed flask, so that no water escapes. The solution expands a little on warming. Molar mass of water: . Statement I: After warming, the mole fraction of in the solution is still . Statement II: The molarity of the solution is the same at both temperatures, because no solute or solvent is lost.
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← Read these statements about amounts of substance. Atomic masses in g mol⁻¹: H 1, C 12, N 14, O 16, Na 23, S 32, Cl 35.5, Ca 40. (i) 9.8 g of H₂SO₄ contains 0.40 mol of oxygen atoms. (ii) 5.85 g of sodium chloride contains 6.022 × 10²² molecules of NaCl. (iii) 0.50 mol of CaCl₂ contains 1.5 mol of ions. (iv) 3.2 g of O₂ and 3.2 g of O₃ contain equal numbers of oxygen atoms. (v) 2.8 g of N₂ and 2.8 g of CO contain equal numbers of molecules. How many of the statements above are correct?In a closed vessel, 14.0 g of nitrogen and 2.40 g of hydrogen react completely: N₂ + 3H₂ → 2NH₃. Nothing else is in the vessel. A student says that nitrogen must run out first, because fewer moles of it are present. Atomic masses in g mol⁻¹: H 1, N 14. Which statement about the vessel at the end is correct? →
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