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- Thermogravimetric analysis of a zeolite of composition CaAl2 Si6 O16.nH2 O shows a mass loss of 20 per cent on heating to dryness. Determine n.What is the crystal field stability energy (CFSE) value for [RhMe3(PMe3)3]?A 0.7336-g sample of an alloy that contains copper and zinc is dissolved in 8 M HCl and diluted to 100 mL in a volumetric flask. In one analysis, the zinc (At. Mass = 65.38 g/mol) in a 25.00-mL portion of the solution is precipitated as ZnNH4PO4, and isolated as Zn2P2O7 (FM = 304.70g/mol), yielding 0.1163 g. The copper (At. Mass = 63.55 g/mol) in a separate 25.00-mL portion of the solution is treated to precipitate CuSCN (121.63 g/mol), yielding 0.2383 g. Calculate the %w/w Zn and the %w/w Cu in the sample.
- Synthesis of potassium trioxalato-aluminate (K3 [Al (C2O4)3].3H2O)Give typed full explanation A stock solution of lithium phosphate (Li3PO4, MM= 115.794361 g/mol) is prepared by dissolving 295.8 g Li3PO4 in deionized water to a final total volume of 1.000 L. Suppose a 1.000-mL aliquot is taken from this stock solution and transferred to a new container to which deionized water is added until the total volume is 50.00 mL. A new 1.000-mL aliquot is taken from this 50.00 mL solution and transferred to a third container to which deionized water is added until the total volume is 25.00 mL. Calculate the number of individual lithium ions (Li+) in the final 25.00-mL solution. Note that lithium phosphate is a strong electrolyte that completely dissociates in water (note that (aq) means the species is a solute in an aqueous solution): Li3PO4 (aq) 3 Li+ (aq) + PO43– (aq) Report your answer to two significant figures. Use scientific notation. Example: 1.0*10^23 (this notation means 1.0 1023)Think that an alloy Cu-60wt%Ag is slowly cooled from the Liquid Phase Field. How many grams of total alpha are present at 778°C? The total alloy amount is 1000grams
- A solution of sodium thiosulfate, Na2S2O3 was standardized by dissolving 0.188 g of KIO3 (MM = 214.00) in water, adding a large excess of KI, and acidifying with HCl. The liberated iodine required 18.25 mL of the thiosulfate solution to decolorize the blue starch/iodine complex. Calculate the molarity of Na2S2O3 solution. Stoichiometry of the reaction is: 1 mol IO3- = 3 mol I2 = 6 mol S2O32-Findthemass%ofH2O2 inasolutionmadefrom36gofH2O2 and84gofH2O: A) 84% B) 36% C) 43% D) 30.% E) 70.%Propose purification methods for cobalt(II) sulphate (CoSO4.7H2O)
- melting and boiling points of d-block elements are very high. explain, also variation in M.P and B.P as we move in a particular series of d-block elements.Give only typing answer with explanation and conclusion Calculate the coordination number of the following compounds by using its relation to its stoichiometry: i) KCl , C.N of K+: 6 ii) CaF2 C.N of F-: 4 iii) CsCl, C.N of Cs+: 8 iv) TiO2 : C.N of O2-: 3The key reaction (unbalanced) in the manufacture of syn-thetic cryolite for aluminum electrolysis is HF(g)+ Al(OH)₃(s) +NaOH(aq) →Na₃AlF₆(aq) +H₂O(l) Assuming a 95.6% yield of dried, crystallized product, whatmass (in kg) of cryolite can be obtained from the reaction of 365 kg of Al(OH)₃, 1.20 m3of 50.0% by mass aqueous NaOH (d=1.53 g/mL), and 265 m³ of gaseous HF at 305 kPa and 91.5°C? (Assume that the ideal gas law holds.)
