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The absolute maximum efficiency for a perfect solar cell in tightly controlled laboratory conditions is 30% whereas a typical commercial cell-say kind you might buy for your house-might be 4 to 15% efficient. Can you think of at least three reasons why commercial solar cells used outdoors may not be as efficient as those in laboratory?
A solution of a protein contains 0.382 grams of the material in 1.00 L of solution. At a temperature of 25°C,this solution has an osmotic pressure of 1.07 torr. Calculate the molar mass of the protein.
Assume that the reaction is second order in CV. If [CVo]=1.35x10-5M and the value of k = 0.096 l/mol-min, what is the half-life of the reaction.
The proper concentration for an intravenous NaCl solution is .90g NaCl per 100 mL of water(sometimes referred to as .90% m/v) If the van't Hoff factor of NaCl is i=1.8, what is the osmotic pressure of blood at body temperature, 37 degree C ? =_____at..
To prevent tank rupture during deep-space travel, an engineering team is studying the effect of temperature on gases confined to small volumes. What is the pressure of 3.20mol of gas measured at 251 degrees Celcius in a 1.75-L container assuming r..
Molecular iodine, I2 (g), dissociates into iodine atoms at 625 K with a first-order rate constant of 0.271 s-1. If you start with 5.2x10^-2 M I2 at this temp.
A hypothetical weak acid, HA, ws combined wih NaOH in he following proporions: .2 mol of HA, .08 ml of NaOH. The mixture was diluted o a total volume of 1.0 L and the pH measured.
Compute the boiling point of the above solution in Farenheit.
A sample of 0.2140 g of an unknown monoprotic acid was dissolved in 25.0 mL of water and titrated with 0.0950 M NaOH. The acid required 27.4 mL of base to reach the equivalence point.
A 1.91 L flask at 17degree contains a mixture of Nitrogen , He and Ne at partial prassure 0f 0.261 atm for N2, 0.195 atm for He, and 0.397 for Ne. Calculate the volume in liters at STP occupied by He and Ne if the N2 is removed.
50.0 mL of an HCl solution with a pH of 3.5 neutralizes 200.0 mL of a Ca(OH)2 solution.What is the molarity of the Ca(OH)2 solution?
What is the pressure in a gas container that is connected to an open end u tube manometer if the pressure of the atmosphere is 742 torr and the level of mercury in the arm
What is the final temperature in a squeezed cold pack that contains 40.0 g of NH4NO3 dissolved in 135 mL of water? Assume a specific heat of 4.18 J/(g·°C) for the solution, an initial temperature of 25.0°C
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