SI concentration practice – Flashcards
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The maximum allowed concentration of chloride in a municipal drinking water supply is 102 ppm Cl-. When the supply of water exceeds this limit, it often has a distinctive salty taste. What is this concentration in moles Cl-/liter?
answer
.002877
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If the density of a 40.0 mass % solution of ethylene glycol (C2H6O2) in water is 1.0514 g/mL at 20 degrees Celcius , what is the molarity?
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6.78
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Determine the molality and of a solution prepared by dissolving 75.0g Ba(NO3)2 (s) in to 374.00g of water at 250C.
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.765
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Find the molarity of 21.4 m HF. This aqueous solution has a density of 1.101 g/mL.
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16.5
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An aqueous solution has 0.0070 gram of oxygen dissolved in 1000. grams of water. Calculate the dissolved oxygen concentration of this solution in parts per million. ]
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7.0
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10.0 g pentane, 10.0 g hexane and 10.0 g benzene. What is the mole fraction of hexane?
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.303
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Suppose you are given a concentrated solution of HCl which is known to be 37.0% by mass HCl and has a solution density of 1.19 g/mL. What is the molarity of HCl?
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12
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A solution contains Cu2+ ions at a concentration of 3 x 10-4 M. What is the Cu2+ concentratrion in ppm?
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19
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What is the molality of a solution of benzene, C6H6, in toluene, CH3C6H5 if the mole fraction of the benzene is .150
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1.92
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What is the mole fraction of cinnamic acid in a mixture that is 50.0% weight urea in cinnamic acid (urea = 60.06 g/mol; cinnamic acid = 148.16 g/mol)
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0.2885
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A 0.750 M solution of sulfuric acid (H2SO4) has a density of 1.046 grams per milliliter at 20 oC. What is the molality of the solution?
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.771
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An Antifreeze solution is prepared by dissolving 17.2 grams of ethylene glycol (Molar Mass 62.07 grams per mole) in 0.500 kg of water. The final volume of solution is determined to be 515 mL. What is the mass percent?
answer
3.33
