Chapter 1 – Basic Concepts of Chemistry
Assignment 9
I
Q.1. How many moles and how many grams of sodium chloride are present in 250 mL of a 0.50 M NaCl solution ?
Q.2. A solution is prepared by dissolving 2 g of substance A in 18 g of water. Calculate the mass percentage of solute.
Q.3. Calculate the concentration of nitric acid in moles per litre in a sample which has a density, 1.41 g mL–1 and the mass percent of nitric acid in it being 69%.
Q.4. What is the mole fraction of the solute in 2.5 m aqueous solution?
Q.5. 2.46 g of sodium hydroxide (molar mass = 40) are dissolved in water and the solution is made to 100 cm3 in a volumetric flask. Calculate the molarity of the solution.
Q.6. Calculate the molality of a solution containing 20.7 g of potassium carbonate dissolved in 500 mL of solution (assume density of solution = 1 g mL–1).
Q.7. A solution is prepared by adding 60 g of methyl alcohol to 120 g of water. Calculate the mole fraction of methanol and water.
Q.8. A solution is prepared by dissolving 18.25 g of NaOH in distilled water to give 200 ml of solution. Calculate the molarity of the solution.
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