A chemistry student needs 70.0 g of dimethyl sulfoxide for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that -3 Calculate the volume of dimethyl sulfoxide the student should pour out. the density of dimethyl sulfoxide is 1.10 g-cm Round your answer to 3 significant digits.
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- How many grams of NaOH would you need to make 3,982 mL of a 3 M NAOH solution (m.w. = 40.00 g/mol)? Report your answer in the requested units to the nearest 2 decimal places (Example "40.02"). Do not report the units in your answer; enter the numbers only. It is recommended that you do not round between calculation steps.The Ksp of lanthanum fluoride, LaF3, is 2.00 × 10-19. Calculate the molar solubility, x, of this compound. -5 1.27 x10 x = Incorrect Answer MA chemist prepares a solution of aluminum sulfite (Al, (SO,).) by measuring out 179. µmol of aluminum sulfite into a 300. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mmol/L of the chemist's aluminum sulfite solution. Be sure your answer has the correct number of significant digits. mmol x10
- A sample of steel weighing 2.00 g is analyzed for Cr (AW 52.0). The Cr is oxidized into chromate with alkaline permanganate and the excess permanganate is destroyed. A certain volume of 0.120 M FeSO4 is added to the acid solution and the excess is titrated with 0.0220 M KMnO4, requiring 31.0 mL. If the sample contained 0.50 % Cr, what volume (in mL) of FeSO4 was added?An analytical chemist is titrating 205.5 mL of a 0.5600M solution of hydrazoic acid (HN3) with a 1.100M solution of NaOH. The pK of hydrazoic acid is 4.72. Calculate the pH of the acid solution after the chemist has added 111.8 mL of the NaOH solution to it. Note for advanced students: you may assume the final volume equals the initial volume of the solution plus the volume of NaOH solution added. Round your answer to 2 decimal places. pH = 0In a neutral solution, the [H*] is : * 1.0x10-14M zero 1.0×107M O 1.0x10-7M
- How many grams of NaOH would you need to make 7,252 mL of a 230 mM NaOH solution (m.w. = 40.00 g/mol)? Do not include units in your answer; report your answer in the requested units.A mixture containing only KCl and NaBr is analyzed by the Mohr Method. A 0.3172-g sample is dissolved in 50 mL water and titrated to the Ag2CrO4 endpoint, requiring 36.85 mL of 0.1120 M AgNO3. A blank titration requires 0.71 mL of titrant to reach the same endpoint. Report the % (w/w) KCl and NaBr in the sample. [Ans . 84.41 % (w /w); 17.59 % (w /w)]A chemistry student weighs out .119g of hypobromous acid (HBrP) into a 250 mL volumetric flask and diluted to the mark with distilled water, he plans to titrate the acid with 0.0600M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the equivalence point.
- 5Determine the molarity of 3.72 moles of NaBr in 575mL of solution. (MM NaBr= 102.89 g/mol) Report your answer to 3 significant figures. Do not include the unit when writing your answer.A chemist combined chloroform (CHCI,) and acetone (C, H,O) to create a solution where the mole fraction of chloroform, Xchloroform, is 0.187. The densities of chloroform and acetone are 1.48 g/mL and 0.791 g/mL, respectively. Calculate the molarity of the solution. Assume the volumes are additive. molarity: Calculate the molality of the solution. molality: m