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- 1. "Diffusion" sounds slow, but on the scale of a cell it is very fast. The average instantaneous velocity of a particle in solution is v= (kT/m)", where k = 1.38 X 101 g cm?/K sec², T= temperature in K, m = mass in g/molecule. A) Calculate the instantaneous velocity of a molecule of glucose and a molecule of myoglobin (a protein), at 37°C [molecular mass for glucose = 180 g/mol; molecular mass for myoglobin = 15,000 g/mol].In our chemistry laboratory class, the formula for surface tension given is y=mg/2(pi) x r x f where y=surface tension, m= mass of the drop, g= gravitational acceleration, pi is 3.1415, r= outer radius of burette, f=correction factor. Now I searched the internet and it says that the unit for surface tension is kg x m/s^2. The problem is I have grams for the mass of the drop and that the outer radius of the burette is in centimeter while the gravitational acceleration is in meter. What will happen is like this: (1 g x 9.8 m/s^2) / 2 (3.1415) x 0.15 cm x 0.74643 (correction factor no unit) As you can see, if I don't cancel m and cm, the unit will be g x cm x m x s^2. However if change the radius of the burette into meter, it will cancel, the unit will be g x s^2 (missing meter). What can I do to get kg x m/s^2 as the unit for final answer?A chemistry student weighs out 72. g of an unknown solid compound X and adds it to 550. mL of distilled water at 19.° C .After 10 minutes of stirring, only some of the X has dissolved. The student drains off the solution, then washes, dries and weighs the X that did not dissolve. It weighs 64. g .
- 8. Mercury thermometers have been phased out because of the toxicity of mercury vapor. A common replacement for mercury in glass thermometers is the organic liquid isoamyl benzoate, which boils at 262°C. What is its boiling point in (a) °F? (b) K?A sample of volume 270 cm³ has a mass of 0.645 kg. (a) What is the density of the sample? (b) Is the material gaseous or condensed? g/cm3A sample of nitrogen gas, N2, travels 17.0 cm in 4.5 minutes. How long in minutes would it take chlorine gas, Cl2, to travel a distance of 17.0 cm under the same conditions?
- 5. (optional) Blue turquoise is an example of a hydrate mineral containing copper; the chemical formula is CuAl6(PO4)4(OH)8•4H2Ó. What is the percent water in this semiprecious stone?(a) A solution of 20.91 % by weight H2SO4 has a specific gravity of 1.150. What is the normality of this solution? (b) Water is added to dilute this solution to a solution of 3.03% by weight H2SO4 (SG= 1.020). What is the new normality of the resulting solution and how were they mixed? (Assume 100 mL of the original solution was used.)1.) In the Dumas method for determining the molar mass of an unknown volatile liquid, a sample of a volatile liquid that boils below 100 oC is vaporized in a boiling water bath and the mass of the vapor required to fill the flask is determined. The following data was collected: Flask Volume 100.0 +100.0 + 79.6 mL = 279.6 mL Mass of Flask + Cap 143.85 g Mass of Flask + Condensed Liquid 144.95 g Mass of Condensed Liquid 1.10 g Temperature of Water Bath (oC) 84.1 oC Barometric Pressure (atm) 0.985 atm a.) What is the molar mass of the unknown? b.) What will its temperature be when the pressure is 1.20 atm and the volume is 250.0 mL?
- A glass vessel weighed 20.2376 g when empty and 20.3102 g when filled to an etched mark with water at 4 °C. The same was dried and filled to the same mark with a solution at 4 °C. The vessel was then found to weigh 20.3300 g. What is the density of the solution?A certain substance X has a normal boiling point of 131.9°C and a molal boiling point elevation constant =Kb·1.78°C·kgmol−1. A solution is prepared by dissolving some urea ((NH2)2 CO) in 600.g of X. This solution boils at 133.7°C. Calculate the mass of urea that was dissolved. Round your answer to 2 significant digits.A graduated cylinder (measuring cylinder) contains 27 mL of water at 25 °C and the mass of the water is 26.92 g. A sphere of iron with a diameter of 18.0 mm is added to the water in the graduated cylinder. The total mass of the water and the iron is 50.92 g. (The volume of a sphere is given by the expression: V = (4/3)ar³). (i) Calculate the total volume of the water and the iron in the graduated cylinder. (ii) Determine the density of iron at 25 °C? Show your calculations. (iii) Without doing any calculations, what do you think the density of 48.00 g of iron is at the same temperature? Explain your answer.
