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How long does it take to electroplate 0.5 mm of gold on an object with a surface area of 31 cm2 from an Au3+(aq) solution with a 8 A current? Recall the density of gold is 19.3 g/cm3.
A household lightbulb is a blackbody radiator. Many light bulbs use tungsten filaments that are heated by electric current. What temperature is needed so that ?max=550nm?
What volume (V) of 1.80 M NaOH solution must you add in order to prepare an acetate buffer of pH = 4.87? (The pKa of acetic acid is 4.76.)
The 100.0mL sample was treated with a molybdate reagent that precipitates ammonium phosphomolybdate, (NH4)3 [P(Mo12O40)] x 12H2O. This substance was dried at 110 degree C to remove waters of hydration and heated to 400 degree C until it reached a ..
Calculate the amount of heat required to completely sublime 51.0 g of solid dry ice (CO_2) at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 kJ/mol .
the depth of each tank is 2 m and each has a detention time of 4 h. what is the surface area of each tank and what is the overflow rate of each tank in m^3/d*m^2?
How many grams of sodium hydroxide are needed to react completely with 50.1 mL of 0.145 MCoCl2 solution?
In an Fe and Cr voltaic cell where the Fe is in Fe(NO3)2 and the Cr is in Cr(NO3)3; calculate the cell potential at 25 C if the initial concentration in the half cells are as follows [Cr 3+] = 2.45M and [Fe 2+] = .75 M
Alfred bought a new graduated cylinder for his chemistry class. It holds 416 milliliters of liquid. If the cylinder has a radius of 4 cm, then how tall is the cylinder?
What is the principle quantum number for the inner transition metals? (the atomic numbers are 57 through 102, called the lanthanide series
How do you redraw methane to show the tetrahedral character of carbon in methane by drawing methane using solid wedges and dashed wedges?
An aqueous solution of unoxygenated hemoglobin containing 5 g of protein (M= 64000 g/mol) in the 100cm3 of solution is placed in an insulated vessel.
Two parallel disks having diameters of 50 cm are separated by a distance of 10 cm. One disk also has a 20-cm-diameter hole cut in the center. Find the shape factor from the disk A1 to the one without a hole A3.
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