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- Research has been conducted on molybdates as replacements for chromates in the surface treatment of various metals in order to reduce corrosion by the formation of a surface film of MoO,. The overall reaction with iron is 2Fe(s) + 3M00- (aq) + 6H*(aq) - Fe;Os(s) + 3M0O:(s) + 3H;O() Given the following AG; in calories per mole at 25°C: Fe,O; (s) =-177,100, MoO:(s) =-120,000, H:O (1) =-56,690, Mo0; (aq) =-205,420 (a) Is the above overall reaction spontaneous under standard conditions? (b) Calculate the standard electrode potential for the above overall reaction. (c) Write an expression for the electrode potential as a function of molybdate ion concentration and pH. (d) Is the overall reaction spontaneous for a molybdate ion concentration of 0.001M at pH 7.0?Use the values of AH to calulate AH for the follonng reactions. Substance and State AH (LJ/mol) Cag(PO,),(s) C&SO (s) CH,(G) HCN(9) HC(G) H,0(g) NH(9) NH,CI(s) 0,(0) HPO,(1) H,80,(1) 4126 -433 -75 135.1 -92 -242 -46 -314 -1267 -814 (2) + N OH 0O AH" b. Caa (PO), (s) + 31, SO.(1) + 3Ca$O.(s) + 2H,PO, (1) c NH3 (g) + HCIG) NH, CI(s) AH"= kJ 8882. Calculate AH° and ASº for the following reaction, and AG° at 959 K. (-- otal) 3 Fes 5 O2 1 Fe3О4 3 SO2 + A¢H°(kJ/mol) = -100 -1118 -297 S°(kJ/mol·K) = 0.0603 0.205 0.146 0.248 ΔΗ- AS° = AG° =
- Using the AG° values in the table below, calculate the AG; for CaCO3. Са (8) + 3/2 О2 (9) + С (graphite) > СаСОз (s) AG° = ? kJ/mol Reaction AG°, kJ/mol С (graphite) + O2 (9) —+ СО? (9) -394.4 2Ca (s)+ O2 (9) → 2CaO (s) -1206.6 CACO3 (s) → CaO (s)+ CO2 (9) 131.4Caloclate AGat 25°C for the reaGHon of which AHO= +210kd; ASO=32.557h ini- (a) Calculate the standard free energy change as a pair of electrons is trans- ferred from succinate to molecular oxygen in the mitochondrial respira- tory chain. (b) Based on your answer in part a, calculate the maximum number of protons that could be pumped out of the matrix into the intermembrane space as these electrons are passed to oxygen. Assume 25 °C, ApH = 1.4; Aựt = 0.175 V (matrix negative). (c) At which site(s) are these protons pumped?
- 10. When an orange coloured crystalline compound 'A' was heated with common salt and concentrated sulphuric acid, an orange red coloured gas 'B' was evolved. The gas 'B' on passing through NaOH solution gave a yellow solution 'C'. The solution on reacting with an aqueous solution of lead acetate gave a yellow ppt. When H2O2 is added to an acidic solution of 'A', a blue peroxo species CrO5 is formed. (i) Name the crystalline compound (A). What is the gas (B)? (ii) (iii) What is the yellow solution (C)? (iv) Write the reaction of (A) with H2O2 in acidic solu- tion to give CrO5.4. Calculate from the data, AH for the hydrolysis of urea to give carbon dioxide and ammonia in aqueous solution: H2NCONH2 (ag) + H20 (I) ---→ co: (ag) + 2NH3 (ag) From the following data: Cyackise + 2 H2(g) +% Oz(g) + N2(g) ----→ H;NCONH2 (ag) -317.77 KJ/mol H2(g) + % Oz(g) ---→ H;0 (I) Cvaatse + Oz(8)--→ Co2 (ag) % N2(g) + 3/2 Hz (g) ---→ NH3 (ag) -285.85 -413.80 -80.718:51 AM Mon Dec 5 = S BIOL 286 E B Lecture Pow... Bb Lecture Pow... O ELECTROCHEMISTRY Recognizing consistency among equilibrium constant, free... cell A B A student made measurements on some electrochemical cells and calculated three quantities: • The standard reaction free energy AG. The equilibrium constant K at 25.0 °C. • The cell potential under standard conditions º His results are listed below. Unfortunately, the student may have made some mistakes. Examine his results carefully and tick the box next to the incorrect quantity in each row, if any. C Note: If there is a mistake in a row, only one of the three quantities listed is wrong. Also, you may assume the number of significant digits in each quantity is correct. Also note: for each cell, the number n of electrons transferred per redox reaction is 1. n 1 AA 1 1 Explanation 142. kJ/mol O calculated quantities (Check the box next to any that are wrong.) AG - 50. kJ/mol O - 46. kJ/mol O Check www-awu.aleks.com K 24 7.54 x 10 O…
- 6. Calculate the AG for the following reaction at 25 C: (a) N2(g) + O2(g) 2NO(g) (b) H2O1) H2O(g) (c) 2C2H2(9) + 502(g) 4CO2(g) + 2H2Ou) |Calculate AS, and AH at 298 K. AG = -2 ±0.3 x 10² kJ E = 1.18± 0.001V at 298K T = 298K n = 2 F (OF) AS=nF AG=AH-TAS Where n is the number of electrons appearing in the reaction, F is the Faraday constant1. (a) Calculate Eo’ for the process:AgI03(s) + e- ⇔ Ag(s) + I0 3-(b) Use the shorthand notation to describe a cell consisting of a saturated calomel reference electrodeand a silver indicator electrode that could be used to measure pIO3.(c) Develop an equation that relates the potential of the cell in (b) to pIO3.(d) Calculate plO3 if the cell in (b) has a potential of 0.294 V.