The mass of a solid piece of iron Fe(s) should be determined by allowing it to react with a solution of 0.500 L potassium dichromate K2Cr2O7 (aq) in a redox reaction in acidic solution, so that all iron is oxidized into iron (II) ions, Fe2+(aq). Concomitant chromium(III) ions, Cr3+(aq), after the reduction equation: Cr2O7 2−(aq) + 14H +(aq) + 6e − → 2Cr3+(aq) + 7H2O(l) a) Write the complete and balanced reaction equation for the redox reaction where the piece of iron is oxidized into iron (II) ions by the dithromations in the solution. b) A sample of the reaction solution after the oxidation of iron is completed shows that the molar concentration of Cr3+ ions is 0.0162 M. What is the calculated mass of the piece of iron Fe(s) in grams? c) What is the amount of electrons e − in moles transmitted in this specific reaction? Calculate the electrical work wel the oxidation of the piece of iron has created in kilojoules (kJ), using the enclosed electrode potentials E 0 and the formula: if possible, I would like handwritten answers with calculations. Thanks :) equations and formulas are highlighted in image attachments

Electrolysis is the process of using electrical current to cause a nonspontaneous reaction to occur. For example, water molecules do not readily decompose into hydrogen and oxygen. However, water can be decomposed using electrolysis according to the reaction 2 H₂O(1)→ 2H₂(g) + O₂(g) Because electrolysis involves the transfer of electrons, it is classified as a type of oxidation-reduction (redox) reaction. For the given reaction, identify which atoms are oxidized and which are reduced. Which atoms are oxidized? Both oxygen atoms in O₂(g). The oxygen atom in H₂O(1). Both hydrogen atoms in H₂(g). Both hydrogen atoms in H₂O(1). MacBook Pro Which atoms are reduced? Both hydrogen atoms in H₂(g). The oxygen atom in H₂O(1). Both hydrogen atoms in H₂O(1). Both oxygen atoms in O₂(g).

What are the oxidation numbers of nitrogen in the reactants and products of this reaction? a)NH4+ b)NO2-

The quantity of antimony in a sample can be determined by an oxidation-reduction titration with an oxidizing agent. A 5.43 g sample of stibnite, an ore of antimony, is dissolved in hot, concentrated HCI(aq) and passed over a reducing agent so that all the antimony is in the form Sb³*(aq). The Sb³+(aq) is completely oxidized by 28.0 mL of a 0.110 M aqueous solution of KBrO, (aq). The unbalanced equation for the reaction is Bro, (aq) + Sb³+(aq) → Br (aq) + Sb3+ *(aq) (unbalanced) Calculate the amount of antimony in the sample and its percentage in the ore. mass of antimony: percentage of antimony: %

consider the reaction of rubidium metal with water to form aqueous rubidium hydroxide and hydrogen gas 2rb(s)+2h2o(l)->2rboh(aq) assign the oxidation state for each reaction

The quantity of antimony in a sample can be determined by an oxidation-reduction titration with an oxidizing agent. A 5.99 g sample of stibnite, an ore of antimony, is dissolved in hot, concentrated HCl(aq) and passed over a reducing agent so that all the antimony is in the form Sb³+(aq). The Sb³+(aq) is completely oxidized by 25.2 mL of a 0.135 M aqueous solution of KBRO, (aq). The unbalanced equation for the reaction is BrO, (aq) + Sb3+(aq) → Br (aq) + Sb³+(aq) (unbalanced) Calculate the amount of antimony in the sample and its percentage in the ore. mass of antimony: percentage of antimony: %

A sample of iron ore is dissolved in acid, and the iron is converted to Fe2*. The sample is then titrated with 47.20 mL of 0.02240 M MnO4 solution. The oxidation-reduction reaction that occurs during titration is as follows: MnO4(aq) + 5FE2*(aq) + 8H*(aq) → Mn²*(aq) + 5FE3* (aq) + 4H2O How many moles of MnO4¯ were added to the solution? Blank 1 2+ How many moles of Fe were in the sample? Blank 2 How many grams of iron were in the sample? Blank 3 If the sample had a mass of 0.8890 g, what is the percentage of iron in the sample? Blank 4 Blank 1 Add your answer Blank 2 Add your answer Blank 3 Add your answer Blank 4 Add your answer

To measure the amount of calcium carbonate (CaCO3) in a seashell, an analytical chemist crushes a 4.20 g sample of the shell to a fine powder and titrates it to the endpoint with 302. mL of 0.210M hydrogen chloride (HCI) solution. The balanced chemical equation for the reaction is: 2HCl(aq) + CO3(aq) → H₂CO3(aq) + 2Cl¯ (aq) 1 What kind of reaction is this? If you said this was a precipitation reaction, enter the chemical formula of the precipitate. If you said this was an acid-base reaction, enter the chemical formula of the reactant that is acting as the base. If you said this was a redox reaction, enter the chemical symbol of the element that is oxidized. Calculate the mass percent of CaCO3 in the sample. Be sure your answer has 3 significant digits. precipitation O acid-base O redox 0 0 0 п% X

Be sure to answer all parts. Consider the following balanced redox reaction (do not include state of matter in your answers): 2CrO₂ (aq) + 2H₂O()+6C10 (aq) → 2CrO42 (aq) + 3Cl₂(g) + 40H (aq) (a) Which species is being oxidized? (b) Which species is being reduced? (c) Which species is the oxidizing agent? (d) Which species is the reducing agent? (e) From which species to which does electron transfer occur? Electrons transfer from to

Calculate the initial thiocyanate ion concentration, [SCN ]o, in the reaction mixture obtained by combining 2.00 mL of 0.00189 M Fe3* (aq) with 1250µL of 0.00200 M SCN (aq). Give your answer in millimolar (mM) to three decimal places. You may assume that volumes of dilute, aqueous solutions are additive.