ChemistryAdvancedHigh School (11–12)Atoms and Molecules › Stoichiometry and ConcentrationNEETJEE Main
Created by StemPy LabAssertion (A): A student mixes of solution with of solution. Taking the volumes to add, the molarity of chloride ions in the mixture is . 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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← 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?A student dissolves 6.00 g of urea, CO(NH₂)₂ (molar mass 60 g mol⁻¹), in 100 g of water (molar mass 18 g mol⁻¹). The density of the solution is 1.02 g mL⁻¹. (i) Its molality is 1.00 mol kg⁻¹. (ii) The mass per cent of urea is 6.00%. (iii) Its molarity is also 1.00 mol L⁻¹. (iv) The mole fraction of urea is 0.0177. (v) If the solution is warmed in a sealed flask, its molarity stays the same. How many of the statements above are correct? →
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