6. A 190 lb worker in a factory received an exposure to AB which has a molecular weight (MW) of 278 g/mole. AB is completely metabolized in the body to A (MW 194) and B. A is completely excreted in the urine and B is further metabolized to five different compounds. A 24-hr total urine sample was 2060 mL, Analysis showed the concentration of A in the urine was 1.28 ng/mL.. What was the absorbed dose of AB in ug/kg body wt?

13. What is the molar solubility of Pbl2 in an aqueous solution containing 0.15 M Nal? The Ksp of Pblz is 1.4x10-8. a. 6.2x107 M b. 9.3x10-8 M 4.7x10-8 M d. 1.6x107 M e. 2.5x107 M   Only typedc solution

How many grams of Pb(10₂)2 (Kap-3.7x10-13) will dissolve in 500. mL of a 0.0042 M PbCl₂ solution? (Ksp -1.7x10-5)

The measurement of LDH in the serum can be used to diagnose whether tissue damage hasoccurred.Students were tasked with the development of an assay for LDH activity in human serum samplesfrom a control patient (healthy) and a patient who had suffered cardiac damage. Two samples wereprovided, labelled C and D (Control and Diseased serum).The students decided to follow the loss of absorbance of NADH in an appropriate assay buffercontaining pyruvate as the substrate. Q1 (a) By examining the absorbance spectra(in the image attached) of both NAD+ and NADH below, comment why this approach is suitable strategy. Q1 (b). What would be the optimum wavelength at which they should measure absorbance? Give a reason for your answer. The students conducted the assay for LDH activity using the two serum samples. Each cuvette (path length 1 cm) contained 3ml of a suitable assay buffer (including pyruvate as substrate). 20 microlitres of either serum was added to the cuvette and the absorbance values…

in tan add 100 ml of freshly boiled and cooled water and 10 ml of dilute acetic acid to dissolve, add 1 ml of starch IS, titrate immediately with iodine (0.0515 mol/L) VS until a blue color persists for at least 30 seconds (Titrant consumption: 22.15 mL). Each ml of iodine (0.05 mol/L) VS is equivalent to 8.806 mg of CoHsO6 (T=8.806mg/mL). Please calculate the content of the Vitamin C sample. To an accurately weighed 0.2015 g of the Vitamin C (CoHsO6) being examined, 2. Assay of Vitamin C:

Time to purify biochemisfunase! To do this, you’ll need to make MORE buffers. One of the buffers that you need to make requires 150 mM Tris (pH 8), 250 mM sodium chloride (NaCl) and 2 mM dithiothreitol (DTT, a reducing agent that prevents the formation of disulfide bonds in proteins). Your jolly postdoc  friend wants you first to make 500 ml of a1.0M Tris stock solution before making the buffer. Describe how you would make this stock solution, and show all calculations.

14. A 50.0 g sample of SAE 15W-40 motor oil is sent for testing. It was found to contain 13.4 µg of lead. What is the concentration (in M) in the oil? (doil = 0.87 g mL-¹) - A: 1.1 x 10-6

(83,111 Uhread) - hiva.mcgee87 X e 2 new messages takeAssignment/takeCovalentActivity.do?locator=assignment-take [Review Topics) [References) Use the References to access important values if needed for this question. How many mL of a 0.202 M aqueous solution of manganese(II) acetate, Mn(CH3COO)2 , must be taken to obtain 16.0 grams of the salt? ml Submit Answer Retry Entire Group 9 more group attempts remaining eq reg 2reg 2req 2req Cengage Learning | Cengage Technical Support 林 98°F Rain coming PrtScn PgDn DII Home End F10

9. Use the following reaction from the lab to calculate the following: 2Na3PO4 12H₂O(s) + 3BaCl₂ 2H₂O(s) →→→ Bag (PO4)2 (s) +6NaCl(aq) +30H₂O(1) If 2 grams of Ba3(PO4)2 (s) (precipitate) are made, how many grams of BaCl₂ 2H₂O did you start with? If 1.5 grams of Ba3(PO4)2 (s) (precipitate) are made, how many grams of 2Na3PO4. 12H₂O did you start with? ©2022 F'22/S'23 Chemistry I Lab Manual 103 EXPERIMENT 5