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- 7. Consider a1Msolution ofNa3AsO4. Write the charge and mass balance equations for this system. (please type answer not write by hend)An aqueous waste stream that has a maximum concentrationof 0.50 M H₂SO₄ (d=1.030 g/mL at 25C) will be neutralized by controlled addition of 40% caustic soda (NaOH; d=1.430 g/L) before it goes to the process sewer and then to the chemical plant waste treatment facility. However, a safety re-view finds that the waste stream could meet a small stream of animmiscible organic compound, which could form a flammable vapor in air at 40.°C. The maximum temperature of the causticsoda and the waste stream is 31°C. Could the temperature in-crease due to the heat of neutralization cause the vapor to ex-plode? Assume the specific heat capacity of each solution is 4.184 J/gK.Many rivers are affectwd by illegal small scale mining. Study have revealed extremlly high deposite of heavy metals and particulate matters in rivers, making them unwholesome for drinking. With your knowledge in analytical seperation and analysis, .outline a suitable analytical protocol that can be employed to recover polluted water bodies and make them wholesome for drinking.
- Gravimetric analysis of Fe3O4 (MW = 232 g/mole) may be undertaken with the following reactions: Fe3O4 → Fe2O3 → Fe (OH)3. Weight of sample containing 8.00% Fe3O4 that must be taken to obtain a precipitate of Fe(OH)3 (MW = 107 g/mole) that weighs 150 mg is . a. 0.108 g b. 0.325 g c. 1.355 g d. 4.065 g Amount of Fe2O3 (MW = 160 g/mole) from which 150 mg of Fe(OH)3 (MW = 107 g/mole) may be obtained is . a. 0.112 g b. 0.224 g c. 0.448 g d. none of the other choicesWhich of the following factors can be a reason for yied percentage to be low? 1.Reactant impurities exist 2.The temperature of the reaction vessel is to low 3.The reaction has not been given enough time for completion 4.Two of the above factors can be a reason 5.All three of the above factors can be a reason.In the production of magnesium, Mg(OH)2 is precipitatedby using Ca(OH)2, which itself is “insoluble.” (a) Use Ksp valuesto show that Mg(OH)2 can be precipitated from seawater inwhich [Mg2+] is initially 0.052 M. (b) If the seawater is satu-rated with Ca(OH)2, what fraction of the Mg2+is precipitated?
- Potassium dichromate has several industrial applications. To determine the purity of the salt that will be used in different industrial processes, a sample mass equal to 2.660 g was dissolved and quantitatively transferred to a 500.00 mL flask. An aliquot of 25.00 mL of this solution was treated with excess KI and the released iodine was titrated with 0.1000 mol L-1 sodium thiosulfate, spending 27.00 mL. Calculate the purity of the analyzed salt. Data:K = 39.10 O = 16.00 Cr = 52.00 I = 126.9 S = 32.07Jansen Gas creates three types of aviation gasoline(avgas), labeled A, B, and C. It does this by blendingfour feedstocks: Alkylate; Catalytic CrackedGasoline; Straight Run Gasoline; and Isopentane.Jansen’s production manager, Dave Wagner, hascompiled the data on feedstocks and gas types inTables 4.6 and 4.7. Table 4.6 lists the availabilitiesand values of the feedstocks, as well as their keychemical properties, Reid vapor pressure, and octanerating. Table 4.7 lists the gallons required, theprices, and chemical requirements of the three gastypes. Table 4.6 Data on Feedstocks Feedstock Alkylate CCG SRG Isopentane Gallons available (1000s) 140 130 140 110 Value per gallon $4.50 $2.50 $2.25 $2.35 Reid vapor pressure 5 8 4 20 Octane (low TEL) 98 87 83 101 Octane (high TEL) 107 93 89 108 Table 4.7 Data on Gasoline Gasoline A B C Gallons required (1000s) 120 130 120 Price per gallon $3.00 $3.50 $4.00 Max Reid pressure 7 7 7 Min octane 90 97 100 TEL level Low High High Note that each feedstock…5.00 mol of ammonia are introduced into a 1.00-L reactor vessel in which it partially dissociates at high temperatures according to the reaction. 2NH3(g) <-> 3H2(g) + N2(g) At equilibrium at a particular temperature, 1.00 mole of ammonia remains. What is Kc for the reaction at this temperature?
- Zinc(s) (MW=65.38), with a mass of 0.228 g, was reacted with 20.00 mL of NaClO (MW=74.44) according to the following unbalanced ionic equation. Determine the normality of NaClO. Zn(s) + ClO- → Zn(OH)2 + Cl- (in basic medium)The mercury in a 0.8142-g sample was precipitated with an excess of paraperiodic acid, H5IO6: 5 Hg 2+ + 2 H5IO6 ---> Hg5(IO6)2 (s) + 10 H + The precipitate (MW = 1448.8 g/mol) was filtered, washed free of precipitating agent, dried, and weighed, and 0.4114 g was recovered. Calculate the a) % Hg (200.6 g/mol) b) % Hg2Cl2 (472.1 g/mol)If the equilibrium constant for the reaction A+ B ⇌ C is reported as 0.432, what would be the equilibrium constant for the reaction written as C ⇌ A+ B?