S 10. Classify the following reaction: 9d1n ts1lc 3099!s o3lo walici Ba(NO3)2(aq)+NazS04(aq) - 2 NaN O3 (aq) +BaSO4(s) oth 2uto a. Combustion b. Decomposition c. Double Replacement d. Precipitation e. Both C &D f. All of these deo O
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- Consider the equation G = -nF. What are the four terms in this equation? Why does a minus sign appear in the equation? What does the superscript o indicate?The Ostwald process for the commercial production of nitric acid involves the following three steps: 4NH3(g)+5O2(g)4NO(g)+6H2O(g) 2NO(g)+O2(g)2NO2(g) 3NO2(g)+H2O(l)2HNO3,(aq)+NO(g) a. Which reactions in the Ostwald process are oxidationreduction reactions? b. Identify each oxidizing agent and reducing agent.Consider the reaction below: Pb(NO3)2(aq) + 2NH4I(aq) --> PbI2(s) + 2NH4NO3 25 g of 5.0% NH4I (MW 145 g/mol) solution is mixed with 45 g 3.0% solution of Pb(NO3)2 (MW 331 g/mol). Determine the excess reagent and how many moles of it remain in the solution after the reaction.
- A 25.00cm3 of potassium dichromate(K2Cr2O7) solution are added to an acidified aqueous solution of potassium iodide(present in excess). The Iodine was then liberated according to the equation K2Cr2O7(aq) + 14H+(aq) + KI(aq) → K+(aq) + Cr3+(aq) + H2O(l) + I2(aq) required 19.63cm3 of a 0.1478MNa2S2O3 for complete reaction. The equation for the reaction of between Na2S2O3 and I2 is I2 +(aq) + Na2S2SO3(aq) → Na2S4O6(aq) + NaI(aq) Calculate the concentration of potassium dichromate (only 4 decimal places). ________Mol/LThe concentration of CO in air is determined by passing a known volume of air through a tube that contains I2O5, forming CO2and I2. The I2 is removed from the tube by distilling it into a solution that contains an excess of KI, producing I3-. The I3-is titrated with a standard solution of Na2S2O3. In a typical analysis a 4.79-L sample of air is sampled as described here, requiring 7.17 mL of 0.00329 M Na2S2O3 to reach the end point. If the air has a density of 1.23 × 10–3 g/mL, determine the parts per million CO in the airSample: Saline 0.900% (m/v), in sodium chloride (NaCl). Data: M.A. (g/mol): Na = 22.9898; K = 39.0983; Cr=51.9961; Ag = 107.8682; Cl = 35.453; N=14.0067; O = 15.9994. Material available in the laboratory's warehouse: Reagents: distilled water; standardized solution of silver nitrate (AgNO₃), at a concentration of 0.09980 mols/L; Potassium chromate solution (K₂CrO₄) 1%; ammoniacal ferric alum solution [Fe(NH₄)(SO₄)₂] and; nitrobenzene (or cooking oil, alternatively); 0.1000 mols/L potassium thiocyanate (KSCN) standard solution. Glassware: beakers of all sizes available on the market; 50, 100, 150, 200 and 250 ml Erlenmeyers; 10.00 and 25.00 mL volumetric pipettes; 15.00 mL burette; 30.00, 50.00 and 100.00 mL volumetric flasks Calculate the molarity of saline, in terms of the NaCl concentration (concentration in mols/L). (a) 0.900 mols/L (b) 5.84 mols/L (c) 0.154 mols/L (d) 0.0154 mols/L
- Alchemists produced elemental mercury by roasting cinnabar ore in air: HgS(s)+O2(g)→Hg(l)+SO2(g) The volatility and toxicity of mercury make this a hazardous procedure, which likely shortened the life span of many alchemists. Given 100 g of cinnabar, how much elemental mercury can be produced from this reaction?The concentration of arsenic in an insecticide can be determined gravimetrically by precipitating it as MgNH4AsO4. The precipitate is ignited and weighed as Mg2As2O7. Determine the %w/w As2O3 in a 1.627-g sample of insecticide that yields 106.5 mg of Mg2As2O7.An ore is treated with concentrated nitric acid and potassium chlorate to convert all S (32.06 g/mol) to sulfate. The nitrate and chlorate are then removed by repeated furning with concentrated HCl, and the sulfate is precipitated and weighed as BaSO4 (233.40 g/mol). What is the % (w/w) S in an ore, 2.5000 g of which yields 0.6255 g BaSO4 . 3.44 % (w/w) 3.34 x 10-3% (w/w) 18.21 % (w/w) 24.31 % (w/w)
- Assume that 1.00 mL (1.02 g) of crude product mixture is obtained from the reactionbefore the washing steps, and the distribution constant of the product mixture in brine isK = (Cmixture/Cbrine) = 50.0. Assuming that after mixing the product mixture volume isstill 1.00 mL (i.e., the volume lost is small), and the volume of the first brine wash layeris 2.00 mL. What mass (grams) of product mixture is lost (dissolves) in the first brinewash? (See Technique 13.2, p 53.) Show work.7. 5.00 mL of stock solution is diluted to 25.00 mL, peoducing solution ALPHA. 10.00 mL of solution ALPHA is diluted to 25.00 mL resulting in solutin BETA. 10.00 mL of solutionBETA is then diluted 25.00 mL producing solution Gamma. a. Determine the dilution factor in produciing solution Alpha from the stock solution. b. Determine the dilution factor in producing solution Beta from the solution Alpha c. Determie the dilution factor in producing solution Gamma from the stock solution Beta. d. Determine the overall serial dilution factor in producing solution Gamma form the stock solution. Can you help on part d? I looked at my prevois uqestion that was resolved part d was not solved.The following reactions (note that the arrows are pointingonly one direction) can be used to prepare an activity seriesfor the halogens:Br2(aq) + 2 NaI(aq)----->2 NaBr(aq) + I2(aq)Cl2(aq) + 2 NaBr(aq)----->2 NaCl(aq) + Br2(aq)(a) Which elemental halogen would you predict is the moststable, upon mixing with other halides? (b) Predict whethera reaction will occur when elemental chlorine and potassiumiodide are mixed. (c) Predict whether a reaction will occurwhen elemental bromine and lithium chloride are mixed.