Chapter 1 – Basic Concepts of Chemistry
Assignment 10
Q.1. How many grams of Na2CO3 should be dissolved to make 100 cm3 of 0.15 M Na2CO3 solution?
Q.2. A sample of NaNO3 weighing 0.38 g is placed in a 250 ml volumetric flask. The flask is then filled with water to the mark on the neck. What is the molarity of the solution ?
Q.3. 2.82 g of glucose (molar mass = 180) are dissolved in 30 g of water. Calculate (a) the molality (b) mole fraction of glucose and water.
Q.4. Calculate the molarity of pure water (density of water = 1 g mL–1)
Q.5. A solution is 25% water, 25% ethanol and 50% acetic acid by mass. Calculate the mole fraction of each component.
Q.6. A solution of glucose in water is labelled as 10% (w/w). The density of the solution is 1.20 g mL–1. Calculate
(i) molality
(ii) molarity
(iii) mole fraction of each component in solution.
Q.7. A sugar syrup of weight 214.2 g contains 34.2 g of sugar (C12H22O11). Calculate:
(i) molal concentration
(ii) mole fraction of sugar in the syrup.
Q.8. Calculate the volume of 0.015 M HCl solution required to prepare 250
mL of a
5.25 × 10–3 M HCl solution.
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