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When .422 g of phosphorus is burned, .967 g of white oxide is obtained. Determine the empirical formula of the oxide
How would you prepare methyl,phenyl,ketone starting with 1-bromobenzene without using a grignard reaction. please show reactants and intermediates
0.460 mol of NOCl is placed in a 1.00 L reaction vessel at 700 K, and after the system comes to equilibrium, the concentration of NOCl is 0.310 M. Calculate the equilibrium constant Kc for the reaction 2NOCl (g) 2NO (g) + Cl2 (g)
Determine the osmotic pressure of a solution that contains 0.042 g of a hydrocarbon solute (molar mass = 340 g/mol) dissolved in benzene to make a 350-mL solution. The temperature is 20.0°C.
The reaction for the decomposition of dinitrogen pentoxide to form nitrogen dioxide and oxygen gas has the rate constant 1.7 x 10-3 s-1. This is a first order reaction.
how many kilojoules of energy are needed to convert 100 g ice at 10.0C to water at 20.0C? (the specific heat of ice at 10C is 2.01)
In the first half-life of the sample, the total number of disintegrations counted was 2.15 X 1020 . What is the atomic weight of the unknown element
Assume that the amino acids with ionizable side chains have the following pKas: Asp 3.65; Glu 4.25; His 6.0; Lys 10.53, Arg 12.48; Cys 8.18; Tyr 10.07. Also Assume that the a-amino group has a pKa of 9.62, and the a-carboxyl group has a pKa of 2.3..
What do the elements in each group have in common. A block is formed by the 28 elements set off at the bottom of the periodic table. What do these elements have in common
Two peaks on chromatogram have k1= 3.1 and k2= 4.9. column efficiency is 2000 theoretical plates. Void volume is 1mL. Calculate the resolution between these compounds.
A student measures the volume of water delivered by a 1 mL volumetric pipette several times and records measurements of 1.00, 0.97, 1.03, 1.01 and 1.03 mL. What is the average of the five measurements. Report your answer to 5 significant figures a..
A sample of gas with a mass of 1.78 occupies a volume of 961 at a pressure of 753 and a temperature of 16. What is the molar mass of the gas?
Which one of the following pairs of acids and conjugate bases is incorrectly labeled or incorrectly matched?
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