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- A 0.4852g sample of an iron ore was dissolved in acid to the 3+ state, then precipitated as Fe2O3 x H2O. The pp was filtered, washed and calcined to Fe2O3, which gave a weight of 0.2481g. Calculate the Fe % in the sample.A 2.000-g sample of a soil is found to yield 3.73 mg of phosphorus after extraction. What is the concentration of phosphorusin the soil in parts per million?What are the oxidation numbers of Fe(ClO3)3?
- Consider the series of reactions to synthesize the alum (KAl(SO4 )2 · xH2O(s)) from the introduction. (a) Assuming an excess of the other reagents, from one mole of aluminum Al (s), how many moles of alum will be produced? (b) Assuming an excess of the other reagents, from one mole of potassium hydroxide KOH, how many moles of alum will be produced? (c) Assuming an excess of the other reagents, from one mole of sulfuric acid H2SO4 , how many moles of alum will be produced? (d) If you start the synthesis with 1.00 g of Al, 40.0 mL of 1.50 M KOH, and 20.0 mL of 9.00 M H2SO4 , which of the three will be the limiting reagent? (e) Assuming that the product is anhydrous (that there are no waters of hydration), calculate the theoretical yield of alum, in grams, based on the amounts of reagents in part (d). 3. Consider the nickel salt: (NH4 )2Ni(SO4 )2 ·y H2O (Ammonium Nickel Sulfate Hydrate), where y is the number of coordinated waters. (a) Assuming that the product is anhydrous (y = 0),…A secondary step in the process to produce ultra-pure silicon forelectronic applications involves silicon tetrachloride with magnesium in a redox reaction:__SiCl + __Mg→ __Si + __MgClBalance the equation above and assign the oxidation numbers (O.N.) of the atoms in the reactants and products. REACTANTS SIDEO.N. of Si in SiCl : ______O.N. of Cl in SiCl : ______O.N. of Mg: ______PRODUCTS SIDEO.N. of Si: ______O.N. of Mg in MgCl : _______O.N. of Cl in MgCl : ______1. a. How many grams of Mn3O4 can be obtained from 1.00 g MnO2? b. how many ounces of Mn3O4 can be obtained from 1.00 lb MnO2? c. What wt of Mn ore should be taken so that the percentage of MnO2 in the ore can be found by multiplyingy 5 to the number of centigrams og Mn3O4
- The most important commercial ore of chromiumis chromite (FeC r 2 O 4 ). One of the steps in theprocess used to extract chromium from the ore is thereaction of chromite with coke (carbon) to produceferrochrome (FeC r 2 ).2C(s) + FeC r 2 O 4 (s) → FeC r 2 (s) + 2C O 2 (g)What mole ratio would you use to convert from molesof chromite to moles of ferrochrome?What mass of glucose can be produced froma photosynthesis reaction6 CO2(g) + 6 H2O(ℓ) →C6H12O6(aq) + 6 O2(g)that occurs using 19.4 mol CO2?An ore containing Fe3O4 was analyzed by dissolving a 1.5419-g sample in concentrated HCl. HNO3 was then added to oxidize any Fe2+ to Fe3+. The Fe3+ was precipitated as Fe(OH)3 by adding NH3. The precipitate was collected by filtration and was finally heated yielding 0.8525 g of Fe2O3. Report the concentration of Fe3O4 in the sample as %(w/w). (Note: the final answer is said to be 53.4%)
- Basic solutions of Na4XeO6 are powerful oxidants. What mass of Mn(NO3)2•6H2O reacts with 125.0 mL of a 0.1717 M basic solution of Na4XeO6 that contains an excess of sodium hydroxide if the products include Xe and solution of sodium permanganate?For the gravimetric determination of manganese, 1.8762 g of sample containing Mn was dissolved in acid solution and made up to 100 mL in a calibrated volumetric flask. A 25.00 mL aliquot of this solution was transferred to a beaker. The solution was heated to boiling and chemical substances required were added till precipitating MnNH4PO4. After filtering, rinsing, and igniting, 0.5365 g of Mn2P2O7 was obtained. Calculate the % manganese in the sample (Mn: 55, P: 31, O: 16 g/mol).Like heavy water (D₂O), so-called “semi-heavy water”(HDO) undergoes H/D exchange. The scenes below depict aninitial mixture of HDO and H₂ reaching equlibrium.(a) Write the balanced equation for the reaction. (b) Is the valueof Kgreater or less than 1? (c) If each molecule depicted repre-sents 0.10 M, calculate K.