DPP -11C13
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CONCENTRATION
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Q1. 120g of ππππ» dissolved in 900g of π»2π . Density of solution is 1.50g/mol. Find:-
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(i) Molarity & Molality
(ii) Mole fraction of both solute & solvent .
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Q2. 3M πππΆπ ππ. π πππ’π‘πππ has a density 1.25 g/ml. Find the molality.
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Q3. 0.500M of πΆπ»3πΆππππ dissolved in 500 ml of solution. Calculate mass of πΆπ»3πΆππππΒ .
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Q4. Calculate the molarity of a solution of Ethanol in π»2π , Mole fraction of Ethanol is 0.040.
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Q5. 15ppm of πΆπ»πΆπ3 is found in a lake.
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(a) Calculate mass percentage of πΆπ»πΆπ3
(b) Calculate Molality.
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Q6. 36.5% π»πΆπ (by mass), Density of solution 1.50g/ml. Calculate Molarity & Molality.
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Q7. 98% π»2ππ4 (by mass) in π»2π, Density of solution 1.96g/ml.
(a) Calculate mole fraction of each.
(b) Molality & Molarity.
(c) Volume to make 2L of 0.5M solution.
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Q8. Density of methanol is 0.793kg/L. What is the volume needed for making 2.5L of its 0.25M solution.