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- To prepare a very dilute solution of K2Cr2O7 (294.18 g/mol), 0.661 g of K2Cr2O7 was transferred to a 250.0-mL volumetric flask and adding water to the mark. A sample of this solution of volume 1.000 mL was then transferred to a 500.0-mL volumetric flask and diluted to the mark with water. Subsequently, 10.0 mL of the diluted solution was transferred to a 250.0-mL flask and diluted to the mark with water. What is the final concentration of K2Cr2O7 in this last solution?The weight of saturated NaCl was obtained by weighing the collected solid. Was thisan accurate weight of saturated NaCl present in the original sample? Explain youranswer.What molaity of pentane is obtained by dissolving 5g pentane, C5H12, in 245 g hexane C6H12
- Using the data below how do you calculate the percent yield Compounds Mass Cyclohexanol used 150 mg = 0.15g Acetic acid used 70 mg = 0.07 g Ultra Clorox (6% NaOCl solution) used 2mL Cyclohexanone obtained 0.124 gVolume of concentrated reagant required to prepare diluted solutions below: 16 M H3PO4 to prepare 921 mL of 5.0 M H3PO4 16 M H2SO4 to prepare 255 mL of 6.5 M H2SO4 18 M HNO3 to prepare 196 mL of 0.33 M HNO3 15 M NH3 to prepare 75 mL of 2.1 M NH3Convert the concentration below to mM and uM:154.5mg of sucrose (Formula Weight: 342.30g/mole) per 300mL
- How to prepare 100 mL of 10% AlCl3Prepare 0.1 M solutions of NaOH and 0.1 M ethyl acetate using high-purity distilled water. So, weight desired amount of NaOH and ethyl acetate and dissolved in dH2O to prepare stock solution in equal molarity. Mw (NaOH) = 40.0 g/mol , Mw (EtOAc)= 88.1 g/mol, Density(EtOAc): 0.898 g/cm3Find the percentage composition of the following compounds with solution 1. N2O 2. CuBr2 3. NaOH 4. (NH4)2S 5. N2S2
- Run 1 Run 2 Molarity of KMnO4 solution (M) from bottle 0.00101 0.00101 Initial reading of buret KMnO4 (mL) 0.62 11.35 Final reading of buret KMnO4 (mL) 11.33 21.70 Run 1 Run 2 Volume of KMnO4 solution (mL) Moles of MnO4- used for titration (mol) Moles of C2O42- in 100.0 mL of solution (mol) Molarity of C2O42- (M) Molarity of Cd2+ (M) Ksp of CdC2O4 Average Ksp of CdC2O4 Calculations: Moles of MnO4- used for titration of saturated solution CdC2O4 Moles of C2O42- in 100.0 mL of saturated solution of CdC2O4 Molarity of C2O42- in saturated solution of CdC2O4 Molarity of Cd2+ in saturated solution of CdC2O4 Solubility product, Ksp, of CdC2O4A 19.51 ݃ sample of impure methylamine, which contains 72.58% (by mass) of CH3NH2 , isreacted with 30.81 ݃ of pure oxygen gas:4CHଷNHଶ(g) + 9Oଶ(g) ⟶ 4COଶ(g) + 10HଶO(ℓ) + 2Nଶ(g) In another experiment, this impure methylamine was used as follows: An unknown mass of the impure compound is dissolved in enough water to make 500.0 ݉ܮof solution. 20 ݉ܮ of this solution was transferred by pipette to a clean 250 mL volumetric flask andmade up to the mark. The molarity of the CH3NH2 in the final solution was determined to be 0.103 M.Determine the mass of CH3NH2 present in the original amount of impure compound used tomake this solution.Calculate the limiting and excess reagent of 3I2 + 6KOH → 5KI + KIO3 + 3H2O with solutions. 950g=I2, 1500g=KOH