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Ultrasound for 2 hours 2.5 mmol acetylferrocene in flask + 2.5 mmol aromatic annhydride + 20 mL EtOH + 2.5 mmol KOH. Then rotovap until crystallized and add 20 mL cold H2O, stir +10% HCl to neutralize. Filter and wash.
A piece of metal with mass of 147 g is placed in 50-mL graduated cylinder.The water level rises from 20mL to 41ml. what is the density of the metal?
if the solubility of AgNO3 at 40oC is 211 g per 100 g of water, what mass of this solute can be dissolved in 350 g of water at the same temperature?
For the reaction: H2+ClO2 = 2 HOCl; K=0.0900; what us the concentration of (HOCl), at equilibrium if 0.0230 mol of H2 and 0.0230 mol of ClO2
how thick of a veneer is required if some of the water from the meteorite dissociates and the resulting oxygen is used to oxidize one third of Fe+2 in the outer 800 km of the 6000 km proto earth to Fe3+?
HEPES are synthetic amine compounds that are often used to make buffers for biochemical studies. What is the pH of a 1.0 L buffer solution that is 0.250M HEPES
Express the molar concentration numerically using two significant figures. What is the final concentration of D at equilibrium if the initial concentrations of A = 1.00M and B= 2.00M
How many grams of methanol must be added to 7.50 kg of water to lower its freezing point to -13.0 degrees C? For each mole of solute, the freezing point of 1 kg of water is lowered 1.86 degrees Celsius.
A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H2SO4, its mass is 1026.57 g
A sample of glucose contains 1.300x10^21 atoms of carbon.
A glucose solution contains 51.0 g of glucose in 475 g of water. What is the freezing point?
The solubility of N2 in blood can be a serious problem (the "bends") for divers breathing compressed air (78% N2 by volume) at depths greater than 50 ft. Find the volume (in mL) of N2, measured at 25degrees celsius and 1.00 atm, released per liter..
Using the value of Ksp for Agl, and Kf= 1.7 * 10^7 for Ag(NH3)2+1, calculate the molar solubility of Agl in 1.10 M ammonia (NH3) solution.
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