Compare the densities of low-density polyethylene (LDPE) and high-density poly- ethylene (HDPE) with the densities of the liquid alkanes.How might you account for the differences between them?
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Compare the densities of low-density polyethylene (LDPE) and high-density poly-
ethylene (HDPE) with the densities of the liquid alkanes.How might you account for the differences between them?
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- 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: mHow many moles of sodium hypochlorite can be prepared from 32.5 g of NaOH?A solution with a density of 0.876 g>mL contains 5.0 g of toluene 1C7H82 and 225 g of benzene. Calculate the molarity of the solution.
- The melting points of stearic,oleic and linoleic acids are 69C,13C, and -5C, respectivley. Explain these trends based on the structure of these acids.Assuming equal concentrations of conjugate base and acid, which one of the following mixtures is suitable for making a buffer solution with an optimum pH of 7.4–7.6? NaOCl / HOCl (K a = 3.2 × 10 –8) NH 3 / NH 4Cl (K a = 5.6 × 10 –10) NaNO 2 / HNO 2 (K a = 4.5 × 10 –4) NaCl / HCl CH 3COONa / CH 3COOH (K a = 1.8 × 10 –5)Solid iron(II) fluoride (FeF2, Ksp= 2.36 x 10-6) is dissolved in water. If 8.1 x 10-3 mol L-1 of iron(II) ion is found to be in solution. Is the solution saturated, unsaturated, desaturated or supersaturated.
- How many grams of NaOH are needed to make 50 mL of a 0.02 g/mL NaOH solution? How many grams of HCl are needed to make 10 uL of a 0.005g/mL acid solution? How many grams of CuSO4 would you use to make 1 L of an 8 g/L CuSO4 solution? 12 grams of glucose will make how many mL of a 0.5 g/mL solution? If you mix 9 g of NaOH with 90 mL of water, what is the mass/volume (g/mL) concentration of the solution?The pH of a fruit juice is 4.8. Find the hydronium ion concentration, [H3O*], 0 of the juice. Use the formula pH = -log [H3O*]. ... The hydronium ion concentration [H3O*] is approximately moles per liter. (Use scientific notation. Use the multiplication symbol in the math palette as needed. Round to the nearest tenth as needed.)The concentration of alcohol 1CH3CH2OH2 in blood, calledthe “blood alcohol concentration” or BAC, is given in unitsof grams of alcohol per 100 mL of blood. The legal definitionof intoxication, in many states of the United States, is that theBAC is 0.08 or higher. What is the concentration of alcohol,in terms of molarity, in blood if the BAC is 0.08?
- Organic polymers have a similar composition to that of common carbohydrates(predominantly composed of Carbon, Hydrogen and Oxygen atoms). By principle, somecarbohydrates readily react with oxygen gas to produce carbon dioxide and water vapor,explain why this principle doesn’t spontaneously work on organic polymer wastes such asPolyethylene terepththalate (PET) and Polystyrene (PS)?Consider the following acids and their ionization constant, determine which conjugate base is HCOOH Ka = 1.7 x 10-4 (b) HCN Ka = 4.9 x 10-10Determine the number of moles in 1.95 x 1023 formula units of MgCl2.