3) A mixture of 80.0 g of chromium (VI) oxide, Cr2O3, and 8.00 g of solid carbon, C, is used to produce elemental chromium, Cr, by the reaction below Cr203 (aq) + 3C (s) → 2Cr (s) + 3CO (g) a) What is the theoretical yield of Cr that can be obtained from the reaction mixture? (b) Given that the actual yield is 21.7 g Cr, calculate the percentage yield for the reaction. (c) Which reactant is the limiting reagent? Which one is present in excess and by how much?

Q: Zinc is used but not copper for the recovery of metallic silver from the complex [Ag(CN)2 ]-,…

A: The reason why  Zinc is used but not copper for the recovery of metallic silver from the complex…

Q: a copper sample of mass 500g and purity 80% reacts with dilute nitric acid. a) Write the chemical…

A: Given that: Total mass of copper = 500g  The purity of copper = 80 % To find: chemical equation…

Q: What is the colour of FeSO4.7H2O crystals? How does this colour change upon heating? Give balanced…

A: The chemical formula of ferrous sulphate heptahydrate is FeSO4.7H2O and it can be also called as…

Q: (i) Name the method of refining of metals such as Germanium.(ii) In the extraction of Al, impure…

A: Refining is a process of eliminating impurities to obtain metals of high purity. These impurities…

Q: In determining the manganese dioxide content of a pyrolusite mineral. A sample of 0.5261 g of…

A: Equation representing reaction of KMnO4 with oxalate: 2 MnO4- + 5 C2O42- + 16 H+ = 2 Mn2+ + 10 CO2 +…

Q: The key reaction (unbalanced) in the manufacture of syn-thetic cryolite for aluminum electrolysis is…

A: The balanced chemical equation is as follows, The moles of Na3AlF6 is calculated from aluminium…

Q: Consider the coordination compound (NH4)2[Os(en)(CN)4], the coordination number (C.N.) and oxidation…

A:

Q: What is the oxidation number of chromium in NazCr207?

A:

Q: Many transition metals and their compounds are used as catalysts. Given MnO2, FeCl3, Pt, and Ni,…

A: Catalyst are the compounds that lowers the activation energy of reaction to increase the rate of the…

Q: Write a chemical equation for the reaction of CoCl2 times 6H2O with K3PO4. A solid white precipitate…

A: A chemical equation for the reaction of CoCl2 . 6H2O with K3PO4 is written as follows,

Q: Treatment of Cobalt (II) oxide with oxygen at high temperatures gives Co304. Write a balanced…

A: Write balanced reaction and determine the oxidation number of cobalt in Co3O4 ?

Q: Where does 179.8 Fe(NO3)2 came from?

A: to convert the no of moles into mass ,use formula,no of moles of substance =molar mass of substance…

Q: Write the role of the following: (i) CO in the purification of nickel (ii) Graphite rod in the…

A: The Mond’s process is used for the purification of nickel. This process is also called as carbonyl…

Q: Predict the reaction of Cr2+, Fe2+, Cl-, HClO, Zn(s) when blowing air into an acidic aqueous…

A:

Q: Which one is the electron configuration of Ni atom? Which one is the electron configuration of Fe3+…

A:

Q: Thiosulfate ion (S2O32-) disproportionates in acidic solution to give solid sulfur and aqueous…

A: A Disproportionation reaction is a reaction in which a compound undergoes oxidation as well as…

Q: What is the function of manganese(IV) oxide in the thermal decomposition reaction of potassium…

A: When a larger reactant (MN) is broken into the small molecules (M and N) in the presence of heat or…

Q: Explain the role of each of the following in the extraction of metals from their ores :(i) CO in the…

A: Extraction of metals: Extractive metallurgy is the practice of removing valuable metals from an ore…

Q: Describe the role of the following :(i) NaCN in the extraction of silver from a silver ore(ii)…

A: Given process, (i) NaCN in the extraction of silver from a silver ore(ii) Iodine in the refining of…

Q: A slag sample is known to contain all of its iron in the forms of FeO and Fe2O3. A sample of 1,000 g…

A: Redox reactions are the reaction that involves simultaneous oxidation and reduction reactions. A…

Q: a) Apply MOT to describe bonding in [Fe(H2O)6]³* and [Fe(CN)6]*- b) Describe extraction of uranium…

A: Answer (a) The molecular orbital theory states that each atom tends to combine together and form…

Q: State the principle on which each of the following processes operates: (i) Recovery of silver after…

A: To eliminate pollutants from the metals the way toward refining is finished. The extensively…

Q: Basic physical properties of sulphate group minerals and economical use of these properties. Write…

A: Sulphate group minerals have sulphate ion (SO42-) in their structures. It occurs as gangue minerals…

Q: Using data from Appendix E, calculate the equilibrium constant for the disproportionation of the…

A: Cu+(aq) -----------------> Cu2+ (aq) + e-            E0 = -0.15v Cu+ (aq)+ e- --------------->…

Q: Consider the solutions presented: (a) Which of the following sketches best represents the ions in a…

A: Solution is made up of a solute and solvent, its concentration is same in the whole solution. In a…

Q: explain the preparation of K2Cr2O7 from chromite ore.

A: The first step of this conversion involves the reaction of chromite ore (FeCr2O4) with sodium…

Q: Given the compound: [Co(en)2(OH)2]OH, what is the coordination number for Co? 3

A: We have to predict the coordinator number for the metal Co.

Q: What is the role of CO2 in the extractive metallurgy of aluminium from its ore?

A: The entire scientific and technological processes involved in the extraction and isolation of a pure…

Q: What is the mass percent of iron in each of the following iron ores: Fe₂O₃, Fe₃O₄, FeS₂?

A: Mass percent of an element is given by, Mass % =mass of elementTotal mass(100)

Q: Calculate the nominal concentration of each of the ions in the following minerals in aqueous…

A: The dissociation of Phosgenite (PbCl)2CO3 is shown as,

Q: Which among these metals does not react with the environment? a. Au b. Mg c. Zn d. Fe

A:

Q: The mass percentage of Fe2O3 in hematite ore, knowing that by treating 0.7 g of the ore in a certain…

A: Given:  Mass of ore = 0.7 gm  Mass of FeO = 0.58 gm

Q: 3. When the first half of the solution containing NaCl and KCI, obtained from 2 g of a feldspar…

A: Weight of feldspar= 2 g 2KCl + H2PtCl6  K2PtCl6 + 2HCl Molar mass of KCl = (39+35.5) = 74.5 g/mol…

Q: (i) Indicate the principle behind the method used for the refining of zinc.(ii) What is the role of…

A: The process of extraction of metals ( in pure form) from minerals is termed metallurgy. Minerals may…

Q: Chromium(III) hydroxide, Cr(OH)3, is highly water insoluble. Its molar mass is 103.02 g/mol. a.)…

A: As you have posted multiple parts and have not mentioned which part you want to be solved. Hence we…

Q: 6. What is the pH of bleach with [H3O+] = 4.2 × 10–12 M?

A: H3O+=4.2x10-12 MpH=-log H3O+    =-log 4.2x10-12

Q: How much heat (in kJ) is needed to convert 387 g Fe,03 into pure iron in the presence of excess…

A: Given: The weight of Fe2O3 is 387 g. The given reaction is, 2Fe2O3g+3Cs→4Fel+3CO2g ∆H°=+467.9 kJ

Q: which secondary metallurgical process is used for production of stainless steel.explain specific…

A: Steel is produced from iron ore in the blast furnace, in the secondary metallurgical process for…

Q: A sample of 0.2500 g of an antimony alloy is taken and converted into Sb2O4 by appropriate…

A: Given data, Mass of Antimony alloy = 0.2500g Mass of Sb2O4 obtained = 0.1305g  Atomic weight of Sb =…

Q: Estimate the theoretical density for molybdenum, a BCC metal, when the atomic mass and atomic radius…

A: