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If 2.15 g of an unknown solid nonelectrplyte is dissolved in18.1 g of naphthalene, the resulting solution is foundexperimentally to freeze 4.3 C lower than pure naphthalene. If thefreezing point depression constant for naphthalene is 6.85 C/m,calculate each of the following.
a. The molality of the solution by using only the freezingpoint depression and the freezing point depression constant.
b. The number of moles of unknown dissolved in the 10.1g ofnaphthalene using the mass of naphthalene and the molality of theunknown.
c. The molar mass of the unknown.
d. The molecular formula of the unknown if it is comprised of40.0% carbon, 6.7% hydrogen and 53.3% oxygen.
e. Why is it important to specify that the unkwnon is anonelectrolyte?
Which of the following buffer systems would be the best choice to create a buffer with the pH= 9.00? For the best system , calculate the ratio of the masses of the buffer components required to make the buffer.
the activation energy for the decompostion of HI to H2 and I2 is 186 kJ/mol. The rate constant at 555 K is 3.2 x 10^-7 L/mol*s.
solution of sodium chloride contains 5.2 g nacl in 900 grams of water. what is the concentration of the solution in
How much work is done when 18.0 grams of water vaporize at 100.°C under constant external pressure of 1.00 atm. The equation is: w=-P(delta change)V = -1.00atm * 30.62 L = -30.62 L atm ...and the answer is -3.10 kJ... How do you arrive at -3.10kJ ..
During the late 1800's, hard rock miners replaced candles with carbide lamps for work in mine shafts. The lamps worked by dripping water onto calcium carbide that generated acetylene gas (H2C2) that was burned.
succinate dehydrogenase produces approximately 1.5 ATPs for each succinate oxidized. electrons passing down the electron transport system from succinate dehydrogenase pass through all of the following EXCEPT
What is the expected boiling point of a solution prepared by dissolving 5.83 g of sodium iodide (NaI) in 59.2 g of water (H20)? For water, Tb = 100.00 degrees Celsius and Kb = 0.512 degrees Celsius m-1. The answer is 100.675. Please show a step by..
What minor product(s) might be expected by this method. Give the detailed reaction mechanism leading to the final product (major). What simple chemical test(s) would help establish that you had, in fact, made the desired alkene product
the open end of a melting point capillary tube allow you to measure the melting point of a compound that sublimes?
name and outline the concept which is introduced when more than one valid lewis structure can be drawn for a given
The pKb values for the dibasic base B are pKb1 = 2.1 and pKb2 = 7.8. Calculate the pH at each of the following points in the titration of 50.0 mL of a 0.75 M B(aq) with 0.75 M HCl(aq).
A natural gas mixture is burned in a furnace at a power-generating station at a rate of 13.0 mol per minute. (a) If the fuel consists of 9.3 mole CH4, 3.1 mole C2H6, 0.40 mol C3H8
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