What is the molarity of a solution prepared by dissolving 10.9 grams of KCI(s) i
ID: 999344 • Letter: W
Question
What is the molarity of a solution prepared by dissolving 10.9 grams of KCI(s) in enough water to make 150.0 mL of solution? (A) 0.00100 M (B) 0.0727 M (C) 0.975 M (D) 72.7 M 17. Which is most soluble in water? (A).CH_3F (B) CH_3CH_3 (C) CH_3SH (D) CH_3OH 18. Which is the best molccular-level representation of an aqueous solution of the weak acid HF(aq)? For clarity, water molecules arc omitted. 9.How many species are in one unit cell of a body-centered cubic lattice? (A) 1 (B) 2 (C) 8(D) 9 20. When solid AgCI is mixed with water, some Ag^+ cations and CI^- anions move from the solid into the solution. which statement best describes the movement of cations and anions between phases after equilibrium has been reached? (A)There is no more movement. (B)Movement is from solution to solid. (C)No cations and anions remain in the solid. (D)Movement from solution to solid equals movement from solid to solution.Explanation / Answer
10.B Reason:this is a case of Raoults law. 11.D Reason:a soap is a sodium or pottasium salt of long fatty acid chain with polar (hydrophillic head) and a non polar part(hydrophobic tail). in water it forms a micelle as tail is attracted towards hydrocarbon thus this part is in the interior of the micelle. 12.According to the question, quantity of HCl in 100g of HCl=26.4g Volume of 100g solution=100/1.19=84.034 thus moarity=.724*1000/84.034=8.6 M 13.B Reason:solubility increases with increasing pressure 14.A Reason: this is an endothermic reaction so enthalpy change is positive and entropy is psitive. 15.B Reason:it is polar 16.C molarity=(mass of dissolved solute/gram molecular weight)*(1000/given volume) 17.D Reason: h bonding 18.D Reason: flourine more electronegative than h 19.B
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