All please CRbose alternative the one that best completes the statement er A str

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CRbose alternative the one that best completes the statement er A strong electrolyte is one that A) reacts solution C) Ionizes B) decomposes What is the molarity (M) of CH3OH in a solution prepared by dissolving 117g of sufficient water to give exactly 230 ml of solutioni? A) 0.0841 B) 1.59 C) 119-10-3 D) 11.9 E) 1.59 × 10-3 What is the molarity (M) of HNO3 if 31.5 mL of the acid were needed to neutr 0.0134 M NaOH base? The concentration (M) of the acid is A) 0.0102 B) 0.0204 C) 1.02 D) 0.0051 ) Whe n aqueous solutions ofa are mixed, a precipitate forms. -A) KOH and Ba(NO3)2 B) NiBr2 and AgNO3 C) Nal and KBr D) K2SO4 and CrCl3 E) Li2CO3 and CsI 5) Based on the Activity Series, which one of the reactions below will occu A) 3Hg (I) + 2Cr(NO3)3 (aq) 3Hig(NO3)2 + 2Cr(s) B) Zn (s) + Mn12 (aq) Zn12 (aq) + Mn (s) C) 3 FeBr2 (aq) + 2Au (s) 3Fe(s) + 2AuBr3 (aq) D) SnCl2 (aq) + Cu (s) Sn (s) + CuCl2 (aq) E) 2AgNO3 (aq) + Pb (s) 2Ag (s) + Pb(NO3)2 (aq) In which species does sulfur have a zero oxidation number? B) H2S(g) 6) C) S(s) A) SF2 7) Which reaction has a solid metal that is oxidized from "O 'oxidati A) Ca (s) + H2SO4 (aq) CaSO4 (aq) + H2 (g) B) 2Al (s) + 6HBr (aq) 2A1 Br3 (aq) + 3H2 (g) C) 2Ag (s) + 2HNO3 (aq) 2AgNO3 (aq) + H2 (g) D) Mg (s) + 2HCl (aq) MgCl2 (aq) + H2 (g) E) Zn (s) + 2H1 (aq) Zn12 (aq) + H2 (g) oxidation state as a product?

Explanation / Answer

A) A strong electrolyte is one which exists only as ions in solution; therefore, a strong electrolyte ionizes completely in solution. The correct answer is (C).

B) Molar mass of CH3OH = (1*12.01 + 4*1.008 + 1*15.9994) g/mol = 32.0414 g/mol.

Mole(s) of CH3OH corresponding to 11.7 g = (11.7 g)/(32.0414 g/mol) = 0.36515 mole.

Volume of solution = 230 mL = (230 mL)*(1 L/1000 mL) = 0.23 L.

Molarity of CH3OH = (0.36515 mole)/(0.23 L) = 1.5876 mol/L 1.59 M.

The correct answer is (B).

C) Part of the question is missing; I need the volume of NaOH needed for the neutralization reaction.

D) Rule out (C) and (E) since these two reactions simply involve a displacement of the cations and the anions and the products are water soluble. Rule out (D) because one of the products of the reaction is Cr2(SO4)3 is water soluble. Ba(OH)2, one of th products of the reaction in (A) dissolves, forming the water soluble barium oxide, BaO. Reaction (B) produces AgBr as one of the products and AgBr is insoluble in water, i.e, the reaction produces a solid. The correct answer is (B).

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