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- Masses : Ca = 40.08 g S= 32.07 g O= 16.00 g A 35.0 mL sample of CaSO4 was evaporated to dryness, leaving 0.967 g of residue. What was the molarity of the original solution? step by step pleaseA solution of sulfuric acid was made by dissolving 20.0g of 98% sulfuric acid in a 250mL of water. (H2SO4 = 98.078 g/mol; H2O = 18.015 g/mol)Additional information for 35-37 What if the solution has a total volume of 262ml? 1. Express the concentration of this solution in % by weight.a. 7.3%b. 4.4%c. 8.0%d. 7.8% 2. Express the concentration in molaritya. 0.10 Mb. 2.00 Mc. 0.76 Md. 0.93 M 3. Express the concentration in normalitya. 2.0 Nb. 1.5 Nc. 1.0 Nd. 0.76 N 4. Express the concentration in molalitya. 0.80 mb. 0.77 mc. 1.00 md. 1.50 mA 500 mL solution of 0.250 M NH, is required. What is the volume of 28wt \% of NH, (density = 0.899g / m * L ) required to make this solution? (a) 14.8 mL (b) 2.56 mL (c) 28.3 mL (d) 8.46 mL
- A 1.787 g sample containing some Fe2+ ion requires 31.50 ml of a 0.02188 M KMnO4solution to reach a pink endpoint. What is the percent by mass of Fe2+ in the sample?A researcher wants to determine the concentration of beta-carotene in carrots. She obtains a 0.554 M stock solution of beta-carotene and creates Dilution A by transferring 23.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 99.00 mL. She creates Dilution B by transferring 59.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 73.00 mL. She creates Dilution C by transferring 8.00 mL of Dilution B into a new container and diluting it with solvent to a final volume of 25.00 mL. She measures the absorbance of each solution and obtains the values below. Plot the data in a spreadsheet software and determine the best-fit line. What is the slope of the best-fit line? Report your answer with three places after the decimal. Remember to draw a dilution diagram! The best-fit line will likely look atrocious, since this is completely fictitious data. Solution Absorbance Stock solution 0.971 Dilution A…A 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.
- In one trial of the standardization of a Na2S2O3 solution, a 10.00 mL volume of 5.00×10-3 M KIO3 is pipetted into a 250 mL Erlenmeyer flask. The solution is titrated to the endpoint with 15.79 mL of the Na2S2O3 solution. What is the molar concentration of this sodium thiosulfate solution? note answer is not .0189 MHow many milliliters of a stock solution of 7.00 MM HNO3HNO3 would you have to use to prepare 0.170 LL of 0.550 MM HNO3HNO3? V= mL If you dilute 16.0 mLmL of the stock solution to a final volume of 0.350 LL , what will be the concentration of the diluted solution? M= MA 750. mL sample of 0.13 M K2CO3(aq) is combined with 250. mL of 0.13 M Cu(NO3)2(aq) at a given temperature. At the same temperature: Ksp for CuCO3 = 1.4 × 10–10Ksp for KNO3 = 1.4 × 1010 Which of the following statements is true?
- A researcher wants to determine the concentration of beta-carotene in carrots. She obtains a 0.661 M stock solution of beta-carotene and creates Dilution A by transferring 26.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 94.00 mL. She creates Dilution B by transferring 43.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 75.00 mL. She creates Dilution C by transferring 6.00 mL of Dilution B into a new container and diluting it with solvent to a final volume of 15.00 mL. What is the concentration in mM of Dilution C?What volume of 0.0500 M CoCl2 times 6H2O is required to react completely with 75.0 mL of 0.0500 M K3PO4?Help me answer this question please and show your complete solution please thank you. 8. Suppose you will prepare a 1:1 by ass NaOH solution using 30g NaOH of 97% purity (density=2.13g/mL). . Using this stock solution, you are again to prepare 0.1 M using a 1-L volumetric flask. How much of the solution do you need to prepare such? Use 1g/ml as density of water.