To extract gold from its ore, the ore is treated with sodiumcyanide solution in the presence of oxygen and water.4Au(s) + 8NaCN(aq) + O 2 (g) + 2 H 2 O(l) →4NaAu(CN ) 2 (aq) + 4NaOH(aq)a. Determine the mass of gold that can be extracted if25.0 g of sodium cyanide is used.b. If the mass of the ore from which the gold wasextracted is 150.0 g, what percentage of the ore is gold?

Q: An alloy of iron and carbon was treated with sulfuric acid, in which only iron reacts. 2 Fe(s)+3 H 2…

A: % of Fe in alloy = weight of Fe /weight of alloy x 100

Q: Calculate the mass of silver nitrate, AgNO3 (aq) , that must react with solid copper to provide…

A: Molar mass of copper nitrate = 187.56 gmol-1 Molar mass of AgNO3 = 2× 169.87 = 340gmol-1

Q: The calcium content in a 0.4367-g sample of phosphate rock was determined by first dissolving the…

A: Here we have to determine mass percentage of calcium present in 0.4367 gram phosphate rock  if all…

Q: 1.58g of magnesium hydrogencarbonate was added to a 1.68 mol/L solution of acetic acid, CH3COOH in…

A:

Q: 13. Write the balanced equation, the ionic, and net ionic equation for the reaction of Iron II…

A:

Q: One of the reactions that occurs in a blast furnace, in which iron ore is converted to cast iron, is…

A: According to the mole concept, in terms of mass, the amount of substance in moles is equal to the…

Q: a) Write a balanced chemical equation for the reaction.  b) What mass of acetic acid is in the…

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Q: The reaction of silver metal and dilute nitric acid proceeds according the equation below. 3 Ag(s) +…

A: The balanced reaction given is, Given : Moles of Ag taken = 0.15 mol Concentration of HNO3 = 3.0 M…

Q: 1. A sample of ultrapure silicon was reacted with excess oxidizing yielding SiO₂. After proper…

A: Given : Weight of SiO2 precipitate = 3.1754 g Purity of ultrapure silicon = 99.98%

Q: 1.A solution of zinc nitrate is added to a solution of magnesium sulfate. 2.You make 1.000 LL of an…

A:

Q: One step in the isolation of pure rhodium metal (Rh) is the precipitation of rhodium(II) hydroxide…

A: The balanced reaction taking place is given as, a) Given: Mass of Rh2(SO4)3 = 0.650 g. And mass of…

Q: Silver is often extracted from ores as K[Ag(CN)2] and then recovered by the reaction…

A: Given: Mass of K [Ag (CN)2]=35.27g Formula: Molarity = Moles of soluteVolume of solution in…

Q: Many mining operations produce tailings that can be oxidized to form acids, including sulfuric acid.…

A: Given, 4CuFeS2(s)+17O2(g) +10H2O(I)→4Fe(OH)3(s)+4CuSO4(aq)+4H2SO4(aq)mass of sample CuFeS2(s) = 1.67…

Q: The sodium salt of cacodylic acid, a weak acid, has the formula NaO2As(CH3)2.3H2O. Its molar mass is…

A: The buffer we have here is of a weak acid and and its conjugate base where cacodylic acid is the…

Q: Lead(II) carbonate, also called "white lead," was formerly used as a pigment in white paints.…

A: Consider the given information is as follows; Reaction:      PbC2H3O22 aq   +  H2O l  +  CO2 g    →…

Q: A solution is prepared by dissolving 3.0 g iron(II) chloride (MW=126.8 g/mol) with 75.0 mL of water.…

A: Solution Molar concentration is that the most convenient technique of expressing the concentration…

Q: When potassium cyanide (KCN) reacts with hydrochloric acid, a poisonous gas of hydrogen cyanide is…

A: Given      KCN          +           HCl      →  KCl     +   HCN    mass of KCN   = 0.140 gram…

Q: what mass precipitate (in g) is formed when 20.5 mL of0.800 M Co(NO3)2 reacts with 29.0 mL of 0.800…

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Q: One step in the isolation of pure rhodium metal (Rh) is the precipitation of rhodium(III) hydroxide…

A: The solution is provided in the next step:

Q: The equation for the reaction of copper and dilute nitric acid is: 3Cu + 8HNO3 ⟶⟶ 3Cu(NO3)2 + 2NO +…

A: Answer :-  Volume of Nitric acid (HNO3) solution which contains 27.0% HNO3 by mass and has a density…

Q: When potassium dichromate is added to concentrated hydrochloric acid, it reacts according to the…

A: Interpretation: From the given information, The final concentration of Cr3+ (aq)  and the number of…

Q: Thallium(I) sulfate is an active ingredient in rat poison. We can analyze a sample for the mass…

A:

Q: References A 3.41 g sample of iron ore is transformed to a solution of iron(II) sulfate, FeSO4. This…

A:

Q: 30.0 g of NaOH is added to 0.800 L of 1.00 M Zn(NO₃)₂, what mass in grams of Zn(OH)₂ will be formed…

A: Calculate mole of each Reactant them find out limiting reagent.here is NaOH Mass of Zn(OH)2 =…

Q: (iii) When 90.00 mL of 0.200 M MnO4¬(aq) was reacted with 200.00 mL of 0.280M H2O2(aq), the amount…

A: The complete balanced reaction for the question is : 2MnO4- + 3H2O2 →2MnO2 + 3O2 + 2OH- + 2H2O…

Q: diluted

A: mmoles of HCl = ( Molarity ) • ( volume )  mmoles of HCl = 3.00molL-1 • 25.00mL  mmoles of HCl =…

Q: 3.77 g of potassium is placed in 375 ml of 0.850 mol/l chromium (iii) nitrate solution as follows 3…

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Q: A volume of 10 mL of an unknown hydrochloric acid sample was diluted to 100 mL. The diluted solution…

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Q: A chemist adds 125.0 mL of a 0.183M potassium dichromate (K,Cr,O,) solution to a reaction flask.…

A: Mass of Potassium Dichromate can be calculated in the following way:

Q: 1. A stock potassium dichromate solution (K,Cr,0,; molar mass is 294.2 g/mol) is prepared for…

A: the solution of pottasium dichromate is given

Q: One step in the isolation of pure rhodium metal (Rh) is the precipitation of rhodium(III) hydroxide…

A:

Q: Gold can be extracted from gold-bearing ores by treating the ore with sodium cyanide, NaCN, in the…

A: The mass of Au present in 1.00 x 103 kg of ore is calculated as,                       Mole Au that…

Q: A stock potassium dichromate solution (K,Cr,O,; molar mass is 294.2 g/mol) is prepared for dilution…

A: Given: Mass of K2Cr2O7=25.0 g  Molar mass =294.2 g/mol Moles =25.0 g /(294.2 g/mol)= (25.0/294.2)…

Q: What mass of precipitate (in g) is formed when 20.5 mL of 0.800 M Co(NO₃)₂ reacts with 21.0 mL of…

A: The given chemical reaction is as follows: CoNO32(aq) + 2NaOH(aq) → Co(OH)2(s) + 2NaNO3(aq) The…

Q: Many mining operations produce tailings that can be oxidized to form acids, including sulfuric acid.…

A:

Q: The sulfide ore of zinc (ZnS) is reduced to elemental zinc by “roasting” it (heating it in air) to…

A: Given, 3.30 kg pure Zn 5.32 kg ZnS

Q: Phosphoric acid and magnesium hydroxide react in a neutralization reaction to produce magnesium…

A:

Q: A chemist carries out an experiment to determine the number of moles of Cl– ions in a 1 L sample of…

A:

Q: What is the theoretical yield, in grams, of aspirin ( C 9 H 8 O 4 ), which has a molar mass of…

A:

Q: Some metals will react with hydrochloric acid to liberate hydrogen gas. The general equation for…

A: The balanced reaction taking place is given as (for x = 3), => 2 M (s) + 6 HCl (aq) -------->…

Q: 1.58g of magnesium hydrogencarbonate was added to a 1.68 mol/L solution of acetic acid, CH3COOH in…

A:

Q: 3.77 g of potassium is placed in 375 mL of 0.850 mol/L chromium (III) nitrate solution as follows 3…

A: Limiting reagent: The reactant that completely used up in the reaction is known as limiting reagent.…

Q: Addition of NaOH to a Cu(NO3)2 solution results in the precipitation of Cu(OH)2.               2…

A:

Q: One step in the isolation of pure rhodium metal (Rh) is the precipitation of rhodium(III) hydroxide…

A: In the given precipitation reaction, Amount of Rh2(SO4)3 used = 0.540 g Amount NaOH used = 0.209 g

Q: Solution A is 0.2400 M Ca(NO)2(aq). Solution A is diluted by a factor of 3 to form Solution B.…

A: The reaction taking place is  3As2O3 + 4NO3- + 7H2O + 4H+ → 6H3AsO4 + 4NO Balancing explanation :…

Q: The reaction that represents the formation of solid chromium metal from the oxidation reduction…

A: Iron reacts with chromium(II) acetate to form iron(III) acetate and chromium metal. The equation for…

Q: A chemist adds 195.0 mL of a 0.0685 mM barium acetate (Ba(C,H;02),) : solution to a reaction flask.…

A:

Q: Copper reacts with nitric acid according to the reaction 3 Cu (s) + 8 HNO3 (aq) 3 Cu(NO3)2 (aq) + 2…

A: Since you have posted multiple questions, we are entitled to answer the first only.

Q: Calcium hypochlorite [Ca(OCI)2l is an effective disinfectant for clothing and bedding. If a solution…

A: From given With the given mass and its molar mass , molarity is calculated as follows

Q: Ammonia reacts with hypobromite, OBr, by the reaction 2NH3 + 30BR N2 + 3Br + 3H20. What is the…

A: Given is  2NH3 + 3OBr–  → N2 + 3Br– + 3H2O  Volume of OBr– = 1.0 mL Mass of NH3 = 1.69 mg  MM of NH3…

Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".