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- The formula for 1000 g of polyethylene glycol ointment calls for 600 g polyethylene glycol 400. At $ 19.15 per pint, what is the cost of the polyethylene glycol 400, specific gravity 1.140 , needed to prepare 4000 g of ointment?A cellulose sponge, 7.0 cm x 12 cm x 2.5 cm, weighs 12.0 grams. Calculate the specific gravity of the sponge.The diffusion constant for the amino acid glycine in water is 1.06 × 10⁹ m²/s. In a 2.0-cm-long tube with a cross-sectional area of 1.8 x 10-4 m², the mass rate of diffusion is m/t = 4.2 x 10-14 kg/s, because the glycine concentration is maintained at a value of 8.7 x 10-³ kg/m³ at one end of the tube and at a lower value at the other end. What is the lower concentration?
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- Ceramics used as abrasives must be hard and tough and be able to withstand high temperatures that arise from frictional forces. What is the minimum required hardness (measure in Mohs scale) for a material to be used as abrasive? Your answerIf mass of BCC Leaad Pb=207 g/ mol, and lattice parameter (a) =3.9211×10-8 cm,calculate the (الكثافه المثاليه ) perfect density of Pb //p^:-1Weigh out accurately 9.99 g of copper(II) sulfate pentahydrate (CuSO4·5H2O) by taring using a clean and dry empty 250-ml beaker. 2. Add tap water to the beaker to reach the 50-mL mark on the side of the beaker. 3. Dissolve all the crystals of CuSO4·5H2O in the water using a clean glass rod for stirring. 4. Then using a glass funnel transfer all the blue solution to a 100-mL volumetric flask. Rinse the beaker with about 10 mL of water and transfer the solution to the volumetric flask. Repeat the rinsing of the beaker with another 10 mL of water and transfer the solution to the volumetric flask. This is called quantitative transfer of the solution. 5. Then add enough water to reach the calibration mark of the volumetric flask. (You will need to use a dropper to add the last few drops of water to ensure the meniscus is on the calibration mark). Close the volumetric flask with a stopper and mix the solution well (so that it is homogeneous). 6. You have now prepared a standard solution (or…