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- Patients undergoing an upper gastrointestinal tract laboratory test are typically given an X-ray contrast agent that aids with the radiologic imaging of the anatomy. One such contrast agent is sodium diatrizoate, a nonvolatile water-soluble compound. A 0.378-m solution is prepared by dissolving 38.4 g sodium diatrizoate (NaDTZ) in.l.60 102 mL water at 3 1.2C (the density of water at 31.2C is 0.995 g/cm3). What is the molar mass of sodium diatrizoate? What is the vapor pressure of this solution if the vapor pressure of pure water at 31.2C is 34.1 torr?What will be the new boilng point of 498ml benzene (Kb = 2.53 oC•Kg/mol; Bp = 80.1oC) when mixed with 18g of naphthalene (MW = 128.17 g/mol) to make a non- eletrolyte solution? Density of benzene = 0.876 g/ml)A. Calculate the final percent concentration of the erythrocytes in each well: (NaCl, CaCl2, MgCl2) each solution has a concentration of 0.25M erythrocyte suspension solution (1mL of erythrocyte solution containing 10% washed red blood cells.) 135 microliters of each solution were added to individual wells + 15uL of the erythrocyte solution ex: Well #1= 135uL of (0.25M CaCl2 + 15uL erythrocyte sol.) B. What would be the final concentration of a well with 135uL (0.125M NaCl) + 15 uL erythrocyte solution?
- 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).The solubility of benzoic acid in water is 0.21g per 100mL of water at 10 degrees celsius, 0.27g per 100mL at 18 degrees celsius, and 6.80g per 100mL at 95 degrees celsius. A. At least how much water would be needed to dissolve a 2.00g sample of benzoic acid at 95 degrees celsius? B. If you carried out a recrystallization by dissolving your 2.00g sample in water at 95 degrees celsius, then cooling it to 18 degrees celsius, what would be the maximum yield of benzoic acid? How would the yield be affected if the recrystallization mixture was cooled to 10 degrees celsius instead?10. A 150.0mL sample of salt water is evaporated to dryness. A residue of salt weighing 27.9g is left behind. Calculate the percent mass/volume of the original salt water sample. 11. A solution is made by dissolving 0.900g of salt in 100.0mL of water. Assume that each milliliter of water weights 1.00g and that the final solution volume is 100.0mL. Calculate the %mass and %mass/volume for the solution.
- What will be the new boilng point of 491ml benzene (Kb = 2.53 oC•Kg/mol; Bp = 80.1oC) when mixed with 11g of naphthalene (MW = 128.17 g/mol) to make a non- eletrolyte solution? Density of benzene = 0.876 g/ml) Round you answer in 2 decimal places, unit is not required.The partial molar volumes of acetone and chloroform, in a solution in which the molar fraction of chloroform is 0.4693, are 74.166 cm3mol-1 and 80.235 cm3 mol-1, respectively. What is the volume of 1,000 kg of this solution? Data: M.M. (acetone) = 58.08 gmol-1; M.M. (chloroform) = 119.07 gmol-1.Suppose you have 1 g of a solute X (K = 10) in 100 mL of water (solvent 1) and you want to extract it from water with toluene (C7H8, solvent 2). Ask if: a) Which phase (organic or aqueous) will be at the bottom? Add a print of the source consulted to answer this question. b) If you didn't have a source to consult in order to answer this question, what would you do to know what the aqueous phase is? c) What is the most efficient way to extract X from the aqueous phase: one extraction with 150 mL or three extractions with 50 mL of toluene? Prove your answer mathematically.
- Percentage or Ratio Strength Concentration.Show your complete solution. 1. If 250 mL of 15% (v/v) solution of methyl salicylate in alcohol is diluted to 1500 mL, what will be the percentage strength (v/v) of the final solution? *Note: Indicate the unit. Give your answer in 2 decimal places. Example 100.00 %1. Give the molar concentration of HCl with a specific gravity of 1.18 and 37.0% (w/w) purity (MM=36.5g/mol) 2. A solution made by adding 1.63 g of K2S (MM=110.3 g/mol) to 10.0 mL of H2O has a volume at 20oC of 11.1 mL. Find the molarity and normality of the solution.Calculate the resulting concentration of a solution prepared by diluting 20.00 mL of concentrated hydrochloric acid to 500.0 mL. The specifications of the concentrated hydrochloric acid are 37.2%(w/w) HCl and specific gravity =1.19. (MM= 36.46g/mol)