9. Determine the molar concentration of ethanol (C2Heo) in a wine that is 14% et
ID: 1003646 • Letter: 9
Question
9. Determine the molar concentration of ethanol (C2Heo) in a wine that is 14% ethanol by mass. The density of this wine is 0.93 g/cm3. a. 13.0 M d, 0.14 M b. 0.063 M e, 3.0 M c. 2.8 M 10. A homogeneous mixture of two or more substances is called a. a compound. d. a solution. b. an electrolyte. e. a solvent. C. a mess. 11. In the dilution of 10.0 ml of a0.10 Msolution of HCI to a volume of 20.0 mL, what remains unchanged? a. the moles of HCI in the solution d, the concentration of the HCI solution b. the volume of the HCI solution e. All of the above change. c. the mass of the HCl solution 12. Which one of the following reaction equations is the net ionic equation for the reaction of hydrochloric acid with lithium hydroxide? All species are in aqueous solution. a. H Cl Li OH Licl H2O d. HCI+ LiOH LiCl H2O c. Li CIT LiClExplanation / Answer
10. homogeneous solution of two or more substances is a solution.
11. on dilution, everything changes except the moles of the solute which is HCl in our case. so the answer is A.
12. in aqueous solution, the ions will remain as H+ , Cl- , Li+ , OH- in the reactant. out of which H and OH will form water leaving behind Li and Cl. making e our answer.
10. answer is c, and the explanation is:
since ethanol is 14% by mass, this implies 14g ethanol in 100 g solution.
the number of moles for 14g ethanol are 0.304moles.
the volume of solution would be mass/density (in L) 100g/0.93g/cc
using the definition of molarity = no of moles/ volume of solution in Literes
the answer comes out to be c= 2.8 M.
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