(1) CH4 (g) + 2 O2 (g) CO2 (g) + 2 H2O (l)
Oxidation number of carbon in CH4 is -4
Oxidation number of carbon in CO2 is +4
change in oxidation number for carbon = final oxidation number - initial oxidation number
change in oxidation number for carbon = +4 - (-4)
change in oxidation number for carbon = 4 + 4
change in oxidation number for carbon = 8
Value of n is 8
(2) 2 NO3- (aq) + 4 H+ (aq) + Cu (aq) 2 NO2 (g) + 2 H2O (l) + Cu2+ (aq)
Oxidation number of copper in Cu is 0
Oxidation number of copper in Cu2+ is +2
change in oxidation number for copper = final oxidation number - initial oxidation number
change in oxidation number for copper = +2 - (0)
change in oxidation number for copper = 2
Value of n is 2
Determine the value of n in the Nernst equation for the following reactions: CH4(g) + 2...
1. Determine if each of the following reactions is a redox reaction, or is not a redox reaction. a. C4H8 (g) + O2 + H20 (g) + CO2 (g) b. HCl (aq) + NaOH (aq) → H20 (1) + NaCl (aq) c. Fe2O3 + H2 → Fe + H2O d. Cu (s) + HNO3 (aq) → Cu(NO3)2 (aq) + NO2 (g) + H20 (1) e. CzHe(g) + 5 O2 (g) → 3 CO2 (g) + 4 H20 (g)
8. Using the Nernst equation, determine the ratio of Hg2+ to Cu2+ at equilibrium in an electrochemical cell in otherwise pure water, when in contact with Hg(s) and Cu (s) Potentially useful data: Reaction Hg 2 +2e = Hgº(s) Feste = Fe2 Cu 2 +2e = Cuº(s) 2H + 2e = H2(g) Pb2 +2e=Pbº(s) Ca*2 + 2e = Cdº(s) 1/4 O2(g) + H + = 1/2 H2O 2 02(g) + 2H+ + 2e = H,O2 1/2 NO3 + H +...
Which of the following are redox reactions? CO2(g) + 2H2O(l) H3O+(aq) + HCO3-(aq) 2CuS(s) + O2(g) Cu(s) + SO2(g) 2AgNO3(aq) + Cu(s) Cu(NO3)2(aq) + 2Ag(s) 2AgNO3(aq) + Na2SO4(aq) 2NaNO3(aq) + Ag2SO4(s) CO(g) + H2O(g) CO2(g) + H2(g)
any oxidation-reduction reactions can be balanced by i spection. Try to balance the following reactions by inspection In each reaction, identify the substance reduced and the sub stance oxidized. a. Al(s) + HCl(aq)→AICI3(aq) 12(g) b. CH4(g) + S(s) → CS2(l) + H2S(g) c. C3H8(g) + O2(g) → CO2(g) + H2O(1) d. Cu(s) + Ag+(aq) → Ag(s) + Cu2+ (aq)
For each of the following reactions, balance the chemical equation, calculate the emf, and calculate G° at 298 K. (Use the smallest possible coefficients for H2O(l), H+(aq), and HO-(aq). These may be zero.) (a) In acidic solution copper(I) ion is oxidized to copper(II) ion by nitrate ion. Cu+(aq) + NO3-(aq) + H+(aq) Cu2+(aq) NO(g) + H2O(l) emf V G° kJ (b) Aqueous iodide ion is oxidized to I2(s) by Hg22+(aq). I-(aq) + Hg22+(aq) + H+ I2(s) Hg(l) + H2O(l) emf V G° kJ (c) In basic solution Cr(OH)3(s) is...
Calculate ΔrH for the following reaction: CH4(g)+2O2(g)→CO2(g)+2H2O(l) Use the following reactions and given ΔrH's. CH4(g)+O2(g)→CH2O(g)+H2O(g), ΔrH = -284 kJmol−1 CH2O(g)+O2(g)→CO2(g)+H2O(g), ΔrH = -527 kJmol−1 H2O(l)→H2O(g), ΔrH = 44.0 kJmol−1
UPJ LUIS 2. Determine which of the following reactions are “redox" reactions. Circle the "letter' of only those that represent redox reactions. a. Cu + 4HNO3 = 2 NO2 + 2 H2O + 2 Cu(NO3)2 b. Zn + 2 H+ = Zn2+ + H2 C. BaCl2 + H2SO4 = 2 HCI + BaSO4 d. H+ + Br- => HBr e. 2 Fe + 3 Cl = 2 FeCl3 f. AgNO3 + HCI = AgCl + HNO3 g. 2NaOH + H2SO4...
20. Identify the neutralization reaction. Classify all of the reactions shown below. a) CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (l) b) MgBr2 (aq) + Cl2 (g) → MgCl2 (aq) + Br2 (l) c) HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l) d) BaCl2 (aq) + 2 AgNO3 (aq) → 2 AgCl (s) + Ba(NO3)2 (aq) 23) Calculate the mass and the number of the hydroxide ions in Ca(OH)2 required to react...
Redox Equations Which of the following reactions are redox reactions? Identify the substance oxidized, the substance reduced, the oxidizing agent, the reducing agent. 1.2 Mg(s) + O2(g) → 2 MgO (s) 2. H SO. (aq) + Al(OH) (aq) → Al(SO.) (aq) + H,O (1) 3. 2 Na (s) + H2O (1) ► 2 NaOH(aq) + H2(g) 4. Cao (s) + CO2(g) → Caco, (s) 5. AgNO, (aq) + NaCl (aq) ► AgCl(s) + NaNO, (aq) Identify the substance oxidized, the...
2. Determine the values of E°cell and ΔG° for the following reactions. (a) O2(g) + 4 I–(aq) + 4 H+(aq) → 2 H2O(l) + 2 I2(s) E°cell _________ ΔG°__________ (b) 4 IO3–(aq) + 4 H+(aq) → 2 I2(s) + 2 H2O(l) + 5 O2(g) E°cell _________ ΔG°_________