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- Br HBr K* "OC(CH3)3 L ROOR (peroxide) t-BUOH Na* OCH3 CH;OH NIn following reaction, NH2 is relaced by Br H Cu NO2Atoms in Element 1 Atoms in Element 2 Atoms in Element 3 Atoms in Element 4 Total Atoms in Molecule Total Elements in Molecule Molecule 2 2H20 4 3CO2 3 6. 9H3PO4 27 36 72 0. 6. 1 20 4 12 20 3. 5Bas(PO4)2 15 10 40 40 105 4 2(NH2S 16 22 4Fes(SOaa 12 12 36 60 3AI(HCO.)a 3 9. 27 48 12 6. 24 42 4 10M9SO. 10 10 40 60 5NaPO. 15 5 20 60 3 7M93(PO4)2 21 14 56 91 8(NH.)PO. 24 96 8 32 160 4 4NaHCO, 4 4 12 9KCIO, 9. 9. 27 45 3 2Ca(CIO.)2 2 4 12 18 3 12Ca (PO4)2 11Ca(NO3)2 7AI(OH). 24
- Br Br ОНco HI H A A H! 00 Compound 1 E HT, so cooka Η D FA K2SO4•Al2(SO4)3•24H2O preparation is tested for its purity by converting first to Al(OH)3 then finally to Al2O3. If you start with a 1.2391 g K2SO4•Al2(SO4)3•24H2O and obtained 0.1357 g Al2O3(A). What can you say about the obtained purity value? Is it acceptable?(B). Which is a better choice of precipitate for the quantitative analysis of K2SO4•Al2(SO4)3•24H2O, Al(OH)3 or Al2O3? Explain
- (i) кон ČI (ii) CH;CO2H (ii) OOCH,CH3 'Br DMFa) In the following N₂ + 3H₂ → 2NH3 reaction, is [₁V₁ = 2 ? What does [iVi mean? b) Look at the following formula, is it true? V₁ = (OV) ani T,P,njiWhat is the total number of hydrogen atoms on the right-hand side of this chemical equation? CH;CO,C,H;(1)+H,0(1) → CH;CO,H()+C,H,OH(1)
- A prospector wants to know how much gold is in the ore that he has been mining. A sample weighing 11.2456 grams is dissolved in Aqua Regia (a mixture of HCl and HNO3). That sample is then transferred to a 200.00 mL volumetric flask and diluted to the mark with water. This is called solution 1. A volumetric pipet is used to transfer 10.00 mL of solution 1 to a second 500.00 mL volumetric flask. The second flask is filled to the mark resulting in solution 2. 5.00 mL of solution 2 is analyzed and found to contain 13.45 ppm Au. Answer each of the questions below. 1. What is the concentration of Au in solution 1. The units should be ppm 2. How many micrograms of Au are in the 5.00 mL sample that was measured? 3. How many micrograms of gold were in the 500.00 mL flask containing solution 2. 4. How many grams Au were in the flask containing solution 1 5. What is the %Au in the original sample?2.) Five standardized dilutions of aqueous lead(II) chromate solution were prepared by adding a volume of 0.0010 M PbCrOa(ag) from a buret and then diluting the solution with deionized water to a total volume of 100.0 mL. Use the provided information to determine [CrO42] in each. Hint: enter the decimal before the scientific notation. Mixture Initial Buret Reading (mL) Final Buret Reading (mL) [CrO4?] (M) 5 16.83 42.60 ? x 104redox reaction? Oyes ou O reducing (1)0'H + (bn) os (bp) HO + (bD)'OSH agent: oxidizing agent: redox reaction? O yes ou () (3) 0ɔ (3)0 + (s)Ɔ agent: 0bupnpa agent: buizipixo redox reaction? O yes, ou () FeO (s) + CO(g) Fe(s) + CO, () reducing (3) 0ɔ + ()-1 buizipixo Explanation Check 80 F pnop F1 F2 F3 F4 F5 F7 F8