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A zero-order reaction has a constant rate of 2.40×10?4 M/s. If after 45.0 seconds the concentration has dropped to 2.00×10?2 M , what was the initial concentration
If 0.10g of benzene (C6H6) is ignited in a 0.3 L vesses at 298K and surrounded by 25atm of oxygen: a) write the net reaction; b) how many moles of O2 were consumed? c) how many moles of product were
Three manufacturers are producing carbonated bottled water. One company introduces carbonate by bubbling carbon dioxide into water until
Usually t-butanol absorbs water on exposure to the air. If the freezing point of a 10.0 g sample of t-butanol is measured as 24.59 degrees C, how many grams of water are present in the sample
The freezing point for t-butanol is 25.50 degrees C and kf is 9.1 degrees C/m. Usually t-butanol absorbs water on exposure to the air. If the freezing point of a 10.0 g sample of t-butanol is measur
Hexane has a normal boiling point of 68.7 degrees C. what is the mole fraction of a nonvolatile solute in a hexane solution which has a vapor pressure of 600 torr at 68.7 degress C
Glycine is the simplest of the amino acids. Treat the amine and carboxylic acid groups as functional groups as independent functional groups.
Based on the force vs atomic spacing and energy vs atomic distance curves explain why some materials have high strength and high melting temperatures
Cadmium telluride, , takes the zinc blende structure with a unit cell edge length of . There are four cadmium atoms and four tellurium atoms per unit cell.
Preparation of an ally phosphonate and synthesis of a conjugated diene. Write out the complete mechanism for the reaction.
If you have 4.14 g of caffeine dissolved in 61.0 mL of water and the extraction coefficient between H2O and CH2Cl2 is 21.51. How many grams of caffeine will extract into the CH22Cl2 layer if you use
One can approximate boiling point at reduced pressure using a pressure-temperature nomograph. What would you expect the observed boiling point to be at 50 torr for a liquid that has a boiling point
Assume an organic compound has a partition coefficient between water and diethyl ether equal to 8.95. If there are initially 7.89 grams of the compound dissolved in 100.0 mL of water, how many grams
The vapor pressure of water at 25C is 3.13X10^-2 atm, and the heat vaporization of water at 25 C is 4.39 X 10^4 j/mol. Calculate the vapor pressure of water at 81C.
Calculate the boiling point of this water-ethylene glycol mixture. (The density of ethylene glycol is 1.11 g/mL.)
What volume of distilled water do you need to add to dilute 1 mL of a 100 mM Tris-HCl buffer solution to a concentration of 1 mM
Remember that M1V1=M2V2. What volume of distilled water do you need to add to dilute 10 mL of a 100 mM Tris- HCl buffer solution to a concentration of 10 mM
Based on the Henderson-Hassalbach equation how many mmols of Tris-HCl are there in a 100 mL of a 100 mM Tris-HCl buffer solution at pH 8.1? Note that the 100 mM refers to the sum of Tris and Tris-HC
After you have added 1 N HCl to adjust the pH of the Tris solution to 8.1, what is the ratio (in mmols) of Tris to Tris-HCl in the resulting buffer solution
How many mmols of Tris would you need to prepare 100 mL of a 100 mM Tris solution
The solubility of CO2 in water at 25 degrees celsius and 1 atm is 0.034 mol/L. What is its solubility at a partial pressure in air of 0.00017 atm? Assume that CO2 obeys Henry's Law. Enter your answe
how many sigma bonds and pi bonds, respectively, can be formed by a carbon atom that is sp hybridized
How many grams of urea [(NH2)2CO] must be added to 585 g of water to give a solution with vapor pressure 2.63mmHg less than that of pure water at 30 degrees Celsius
Suppose that this individual now decides to give one-eighth of a percent (0.125 ) of her new net worth to charity. How many dollars are given to charity? The answer is not 10.0025 or 12.5. I have be
determine the volume of a cube 10,62 cm, give an example of four sets of measurements that illustrate an imprecise and inaccurate data