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- Use data from CRC_Std_Thermodyn_Substances and CRC_Std_Thermodyn_Aqueous-Ions to calculate ΔrH∘ΔrH∘ (in kj/mol) for the following at 25 ∘∘C. 2CaC2O4(s)⟶4CO(g)+O2(g)+2CaO(s)a. Give the molar concentration of hydrochloric acid with a specific gravity of 1.18 andhas 37% (w/w) purity. MW=36.5 b. How would you prepare 1.2 L of 0.40 M hydrochloric acid starting from a 2.0 M solution?Preparation of cpper(1) chloride What color observed for the solution of Na2SO3 in water? What colour observed for solutions of CuCl2.2H2O in water? Which ion is responsible for the colour that is observed in the CuCl2 solution? What is observed when th Na2SO3 solution is added to the CuCl2? Which gas can be smelled when H2SO4 is added to the mixture? What is the colour of the CuCl when it is filtered on Buchner funnel? (before it is exposed to the atmosphere) What is the colour of the CuCl when it is filterd on the Bucher funnel? (before it is exposed to the atmosphere) Does the colour of the CuCl remain the same if you leave it to dry in the atmosphere? Calculate the percentage yields for the experiment
- E0 values for Ce4 + / Ce3 + and Fe2 + / Fe values are +1.72 and - 0.4 V, respectively. What conclusion can you draw from these data?1-Why σ2px lie at higher energy level than π2py and π2pz in N2? 2-Discuss the structure of [Ni (CN)6]-2 on base of VBTGiven A, B, and C… [A] U(VI) as uraninite; UO2 (where Fe2+= reductant; Fe(OH)3 ferrihydrite= product): 2Fe2+ + UO22+ +3H2O + H+ ---- > 2Fe(OH)3 + U4+ +2H2O [B] U(VI) as uraninite; UO2 (where Mn2+= reductant; MnO2 pyrolusite= product): 2H2O + UO22+ + Mn2+ ---- > UO2 + B - MnO2 + 4H+ [C] U(VI) as as uraninite; UO2 (where HS-= reductant; S0= product): UO22+ + Hs- ---- > UO2 + S + H+ QUESTION: Use thermodynamic calculations [use redox potential (Eh)] to predict which of the three reductants below is most favorable at pH 3 ? (1) Fe2+ (2) Mn2+ (3) HS-
- 1. A Cr3+ solution is electrolyzed using a current of0.365 A. What mass of Cr(s) (51.9661) is plated outafter 10 hours?2. When an aqueous solution of CuSO4 is electrolyzedcopper metal is deposited. If a constant current waspassed for 5.00 h and 404 mg of Cu (63.546) metal wasdeposited, what was the current?The solubility of Ag₂CO3 is measured and found to be 3.41×10-2 g/L. Use this information to calculate a Ksp value for silver carbonate. Ksp = ___________ The solubility of CaSO4 is measured and found to be 0.689 g/L. Use this information to calculate a Ksp value for calcium sulfate. Ksp = ___________ The solubility of BaF2 is measured and found to be 1.29 g/L. Use this information to calculate a Ksp value for barium fluoride. Ksp = _________ (The attached picture is an example how to solve the given problems; The example's problem is The solubility of Ag2SO3 is measured and found to be 4.51x10-3 g/L. Use this information to calculate a Ksp value for silver sulfite.)Given: 0.35g NaCl, 0.25 g NaHCO3, 0.15 g KCl & 2 g C6H12O6 are present in 100 mL ORS solution (MW: Na: 23, K: 39, Cl: 35, H: 1, C: 12, O: 16) Calculate the total amount of bicarbonate expressed in mmol/L present in the prepared solution a 90.10 mmol/L b 80.61 mmol/L c 29.76 mmol/L d 60.34 mmol/L e 111.11 mmol/L f 20.27 mmol/L
- How many milliliters of 1.5% alcoholic dimethylglyoxime should be used to provide a36.0% excess with 0.6984 q of steel containing 2.95 wt% Ni? Assume that the densityof the dimethylglyoxime solution is 0.790 g/mL. a. How much Ni sample is present? b. How many moles Ni is present in the sample? c. How much DMG is present?Given: 0.35g NaCl, 0.25 g NaHCO3, 0.15 g KCl & 2 g C6H12O6 are present in 100 mL ORS solution (MW: Na: 23, K: 39, Cl: 35, H: 1, C: 12, O: 16) Calculate the total amount of chloride expressed in mmol/L present in the prepared solution 60.34 mmol/L 90.10 mmol/L a 111.11 mmol/L b 29.76 mmol/L c 80.61 mmol/L d 20.27 mmol/LCalculate the pH of a 0.10M solution of NaHSO4 solution taking into account activity (Ka2 = 1.92 for H2SO4).
