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The normal freezing point of benzene is 5.5 degrees C. A benzene solution contains 62.5 mg of naphthalene (MW = 128g/mol) per 1.00g benzene. The solution freezes at 3.0 degrees C. What is the molal freezing point constant for benzene?
What is the pressure of the gas in this mercury manometer if h = 73 mm and atmospheric pressure
What are the experimental conditions of T and P that willbe used to calculated the mass of air in the flask? b) Calculate the density of air at the experimental conditiosnidentified in part a. c) Calculate the mass of air in the flask before the liqu..
Place drying tube filled with CaCl2 on condenser. Heat to reflux at 190 C for 25 minutes then cool. Add 0.5mL tolulene and petroleum ether 0.5-0.75 mL until slight cloudiness remains. Reheat until clear and cool in ice bath. Collect product and wa..
Determine the pH of each of the following solutions Part A. 8.3x10^-3 M phenol
a 255-ml flask contains pure helium at a pressure of 745 torr. a second flask with a volume of 455 ml contains pure
Gas Nitrous Oxide (N20) is used as an anesthetic and in aerosol cans to produce whipping cream. It is a potent greenhouse gas and decomposes slowly to N2 and O2.
What hybrid orbital would be expected for the central atom in each of the following: Draw the molecular structure of these compounds and label Ï? and Ï?bonds.
The frequency of vibration in a quartz watch is 33 kHz. What is the energy required to excite this vibration? Also compute omega for this vibration.
A gas mixture is made by combining 8.1 g each of Ar, Ne, and an unknown diatomic gas. At STP, the mixture occupies a volume of 19.20 L. What is the molar mass of the unknown gas?
Write a balanced net ionic equation for the neutralization of equal molar amounts of nitric acid and methyl amine (CH3NH2). Indicate whether the pH after neutralization is greater than, equal to, or less than 7.
The combustion of carbon with excess oxygen forming carbon dioxide is exothermic. C(s) + O2(g) => CO2(g) ?Hrxn = -393 kJ If 8,622kJ of heat is needed from the combustion, how much carbon (g) must be consumed
a solution is prepared by combining 11.7 grams of sodium hydroxide in approximately 450 mili litres of h2o in a
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