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- Volume of an unknown used was 30 mL, Initial Buret volume was 0 and the Final Buret volume was 8.5 mL. What is the molarity of the unknown solution if the Net volume of NaOH being used was 8.5 mL and Millimoles (mmoles) NaOH reacted was 0.791? Then, what is the Mass (g) of Acetic Acid in unknown sample and thr average percent (%) Acetic Acid? (assume density = 1g/mL)A 18 g of unknown organic sample was dissolve in 756 mL of benzene. The boiling point of benzene was increased by 3.36oC. As the first step of analysis, determine the moecular weight of the unknow sample? Kb of benzene= 2.64oC/m Bb of benzene = 80.09 oC density of benzene = 0.874 g/mL at 25 °C Answer in whole number, no units required.A solute has a KD between water and chloroform of 5.50. Suppose we extract a 50.00-mL sample of a 0.050 M aqueous solution of the solute using 15.00 mL of chloroform. a. What is the separation’s extraction efficiency in fractions? b. What volume of chloroform do we need if we wish to extract 99.5% of the solute? Answer must be in 3 decimal places.
- The distribution coefficient, k = (concentration in hexane/concentration in water), for solute A is 7.5. MAIN QUESTION: Comment on the extraction efficiency of procedure a. versus b. a. What mass of A would be removed from a solution of 10 g A in 90 mL water by a single extraction with 90 mL of hexane? b. What mass of A would be removed by 3 successive extractions with 30 mL portions of hexane?Density of solution:Trial 1: 1.2 g/mLTrial 2: 1.2 g/mLTrial 3: 1.2 g/mL Average density = 1.2 g/mL What is the relative average deviaion, %?hjhdg with solution sdf
- Mass solute needed to prepare 0.500L of 0.2 M NaCO3 from a solid NaCO3 with a purity of 92.0wt%Required is 1L of 3/8 (v/v) strength solution. The usual concentration of the solution is 12% (v/v) acetic acid in water. How many mL of the 12% solution must be used? How many mL of water should be used?1) How many milliliters of 70% ethanol and 20% ethanol must be mixed to prepare 500ml of 30% ethanol? 2) A gaseous blend of nitric oxide and nitrogen (NOmax) contains 0.09% v/v nitric oxide (NO) and 99.92% v/v nitrogen. Express the strength of nitric oxide in PPM (round to whole number) 3) The ratio strength of a 10mL vial of neostigmine methylsulfate injection USP is 1:1500.Calculate the amount of neostigmine methylsulfate in milligrams contained in the 10mL vial. (Round to the whole number).
