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- 4) Ethanol (C2H6O) content in a wine sample can be determined using Cr2O72- solution by redox titration in acidic medium. The unbalanced titration reaction is given below: Cr2Or2-(aq) + C2H6O (aq) Cr (aq) + C2H«Oz (aq) (unbalanced, acidic medium) To titrate 5 mL of wine sample, 38.0 mL of 0.3 M Cr2O" solution is required. What is the molar concentration (mol/L) of ethanol in the wine sample?8. Balance the following equations:(a) SO₂ + 0₂ - SO3(b) Li₂O(s) + H₂O(1) LiOH(aq)(c) Na + H₂O →→→→ NaOH + H₂-(d) AgNO3 + Ni-->Ni(NO3)2 + Ag(e) Bi₂S3 + HC1-->BiCl3 + H₂S(f) PbO₂-->PbO + 0₂(g) Hg₂(C₂H3O2)2(aq) + KCl(aq)-->Hg₂Cl₂(s) + KC2H3O2(aq)(h) KI + Br₂ - KBr + 1₂(I) K3PO4 + BaCl₂ →→→→ KCl + Ba3(PO4)2Complete and balance the following redox reaction in acidic solution Mn2* (aq) + BiO3 (aq) MnO, (aq) + Bia* (aq) 3. 2. 3+ O4+ 04- 6. 8 9. 1 O2 03 O5 O6 17 O8 O9 (s) (1) (g) (aq) 1) Mn OH Bi e H3O* H20 H* Delete 5 4.
- 5. Balance the following reaction. HCl(aq) + KMn04 (aq) +H2O2 (aq)MnClz (aq) +02 () +KCI (aq) + H20 (1) in an acid solutio a. When a reaction is said to be in an acid solution, what species are most commonly present?< 2:50 How many electrons are exchanged in the following reaction? 1 4 7 +/- Question 17 of 17 2 Fe³+ (aq) + 3 Cu(s) = 2 Fe(s) + 3 Cu²+ (aq) 2 5 8 . 3 60 9 O Submit Tap here or pull up for additional resources XU x 100Balance the equation and choose the coefficient of the (?) NazCO3 + HCl → NaCl + H20 + CO2 -> (x)NA2CO3 + (x)HCl → (? )NaCl + (x)H20 + (x)C02
- (7 points) Calculate the silver ion concentration, [Ag*], of a solution prepared by dissolving 8.25 g of AgNO3 and 91.5 g of KCN in sufficient water to make 1.00 L of solution. Assume the reaction goes to completion. Ag (aq) +2CN (aq) Ag(CN)2(aq) kr = 1.0 x 10211. Balance the ff skeleton reactions and identify the oxidizing and reducing agents: a) O2(g) + NO(g) + H2O(1) NO: (aq) + H* (aq) b) CrO (aq) + H20(1) + Cu(s) Cr(OH)»(s) + Cu(OH)>(s) + OH (aq)Determine the molar ration of FeCl3 / NaOH considering the following chemical reaction: FeCl3 (aq) + 3NaOH(aq) ---------> Fe(OH)3 (s) + NaCl(aq) A.) 1/1 B.) 3/2 C.) 3/4 D.) 1/3
- A galvanic cell is powered by the following redox reaction: 3 Cu (aq) + Cr(OH);(s) + 5 OH (aq) → 3 Cu" (aq) + Cro (aq) + 4H,0(1) Answer the following questions about this cell. If you need any electrochemical data, be sure you get it from the ALEKS Data tab. Write a balanced equation for the half-reaction that takes place at the cathode. Write a balanced equation for the half-reaction that takes place at the anode. Calculate the cell voltage under standard conditions. E = Ov Round your answer to 2 decimal places.non Balance the following reaction in basic solution Cr20,2 (aq) + SO2(aq) → Cr3*(aq) + SO3(aq) Coefficients: Note: enter 1 for compounds that show up once in the reaction, enter 0 for compounds that do not appear in the balanced reaction. Cr20,2- SO2 Cr3+ SO3{aq) OH H2021 ETRY AND REDOX REACTIONS If 20% by weight of nitrogen is present in a compound, the molecular weight of the compound may be (a) 144 (c) 100 (b) 28 d) 140 The mineral haematite is Fe2O3. Haematite ore contains unwanted material called gangue in addition to Fe2O3. If 5.0 kg of ore contains 2.78 kg of Fe, What is percentage purity of Fe;O;? A polystyrene, having formula B33C6H2(C&H3)n was prepared by heating styrene with tribromobenzoyl peroxide in the absence of air. If it was found to contain 10.46% bromine by weight, find the value of n. Hexachlorophene, C13H6C16O2, is a germicide in soaps. Calculate weight percent of each element in compound. Determine the empirical formula of Kelvar, used in making bullet proof vests, if it contains 70.6% C, 4.2% H, 11.8% N and 13,4% O: (a) CHSNO2 (c) CH9NO (b) CHSN20 (d) CHSNO In an organic compound of molar mass 108 gm mol C, H and N atoms are present in 9: 1 :3.5 by weight. Molecular formula can be: CaH&N2 7c) CsH&N 8. (b) CHoN (d) CaHN A…
