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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? (the vapor pressure of water at 30 degrees celsius is 31.8mmHg?
A gas sample is known to be a mixture of ethane and butane. A bulb having a 230.0-cm3 capacity is filled with the gas to a pressure of 97.5 × 103 Pa at 23.1oC. If the weight of the gas in the bulb is 0.3554 g, what is the mole percent of butane in..
What is the wavelength of light in unites of nm emitted when the elctron in a hydrogen atom undergoes a transition from level 7 to level 1
How much energy in joules is required to heat 295 mL of coffee from 25.0 0C to 62.0 0C? Assume that the coffee has the same density, 0.997 g/mL, and specific heat capacity, 4.184 rm J/(gc. K) .
A solution of 5.00g of an organic compound in 25.00g carbon tetrachloride boils at 84.8 c at 760torr. What is the molecular weight of the compound. (bpt ccl4 = 76.5 C, Kb = 5.03 C/m)
Using curved arrows to symbolize the flow of electrons, write the stepwise mechanism for the acid-catalyzed esterification of p-aminobenzoic acid to give ethyl p-aminobenzoate.
Briefly explain why caffeine will prefer the methylene chloride solvent to the water solvent? draw the structure for all 3 compounds?
Calculate the entropy change for the water, peroxide, and the entire system
Give a detailed explanation why SN1 mechanisms are not stereospecific but SN2 mechanisms are very stereospecific causing
Calculate ?Ssys (in Joules) when 20.0 moles of oxygen gas undergo an isothermal reversible expansion from 30.0 L to 80.0 L.
How many moles of O2 are needed to burn 1.05 mol of C8H18
A buffer is prepared by adding 23.0 g of sodium acetate ( CH3COONa) to 500 ml of a 0.145 M acetic acid ( CH3COOH) solution. A)Determine the ph of the buffer.
calculate the concentrations of h+, oh-, f-, and undissociated hf molecules in 0.10 M hf. Ka for HF is 7.1x10^(-4).
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