ChemistryAdvancedHigh School (11–12)Atoms and Molecules › Stoichiometry and ConcentrationNEETJEE Main
Created by StemPy LabIn a closed vessel, of nitrogen and of hydrogen react completely: . 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 : H 1, N 14. Which statement about the vessel at the end is correct?
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← A 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.Assertion (A): A student mixes 100 mL of 0.20 M NaCl solution with 100 mL of 0.20 M CaCl₂ solution. Taking the volumes to add, the molarity of chloride ions in the mixture is 0.30 M. Reason (R): When two solutions are mixed, the molarity of an ion in the mixture is the sum of its molarities in the two solutions. →
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