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A solution made by adding 20g of urea to 125g of water has a vapor pressure at room temperature of 22.76 torr, whereas the vapor pressure of pure water at 25 degrees celsius is 23.76 torr. find the molar mass of urea
Infrared Spectroscopy Lab 1) Why must a sample for IR be dry. 2) How will the spectrum be affected if a background scan is omitted or improperly obtained. 3) The stretching from C-C single bonds is virtually invisible to IR . Why
What are the equilibrium concentrations of NH2OH (hydroxylamine), NH3OH+, and OH- in a 0.15 M solution of hydroxylamine (Kb=6.6*10^-9)? What is the pH of the solution
In most instrumental or analytical methods, use of an Internal Standard is considered the least desirable approach for calibrating the method
A rigid cylinder with a movable piston contains a 2.0-liter sample of neon gas at STP. What is the volume of this sample when its temperature is increased to 30.°C while its pressure is decreased to 90. kilopascals.
Express the hamiltonian operator for the internal motion of Li atom and the proper expression for the approximate
An oligomeric protein has a molecular weight of 168000. A 420 mg sample was treated with an excess of 1-fluoro-2,4-dinitrobenzene (Sanger\'s reagent) until the reaction was complete
considering the given equation fe203 3c ----gt2fe3co in which ironiii oxide reacts with carbon to give iron and carbon
The first step of the fischer esterification involves protonation of the oxygen of the carboxylic acid by the acid catalyst:
What words could be used to describe the chemical process that is summarized in each reaction below. a. carboxylic acid in the presence of an acid
The absorbance maxima observed for the following cobalt complexes ([Co(NH3)6]3+ ?max = 470 nm, [Co(NH3)5Cl]2+ ?max = 560nm, [Co(NH3)4Cl2]+ ?max = 630 nm, and [Co(NH3)3Cl3] ?max = 680 nm) can be identified with transitions involving d-electrons. a)..
Structure of a compound that when treated with NaOH and heat, will give more than one product (each product is present in significant amount)
1. calculate the h of a solution obtained by mixing 1 l of hydrochloric acid 1.0 m with 1 litre of sodium hydroxide
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