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The tetraethyl lead Pb(C2H5)4in a 25.00 mL sample of aviation gasoline was shaken with 15.00 mL of 0.02381 M I2. (Hint: one mole of I2reacts with one mole of the tetraethyl lead). After the reaction was complete, the unused I2was titrated with 8.27 mL of 0.02772 M thiosulfate solution. Calculate the weight of Pb(C2H5)4(MW = 323.4 g/mol) in each liter of gasoline.
A 25.0-mL sample of 0.150 M hydrazoic acid is titrated with a 0.150 M NaOH solution. What is the pH after 13.3 mL of base is added. The Ka of hydrazoic acid is 1.9 x 10^-5.
During a work-up, we are asked to interrupt vacuum, "drizzle" cold methanol over the crude product, then reestablish vacuum. What is the purpose of this step and why does the methanol need to be cold
The ratio of Fe^2+ to Fe^3+ concentrations in a solution is 1.0 x 10^3. ([Fe^2+]/[Fe^3+]) = 1.0 x 10^3. Calculate the potential of the solution relative to the saturated Ag/AgCl reference electrode, Eref = 0.204. E^0 Fe^3+/Fe^2+ = +0.771
A zero-order reaction has a constant rate of 2.40×10?4 M/s. If after 45.0 seconds the concentration has dropped to 2.00×10?2 M , what was the initial concentration
a boy use a metalnbsp that was heat up in hot h2o and then put into a styrofoam cup of h2o at room temperature.
The equilibrium constant for a reaction 2SO2 + O2 2SO3 is 2.8 x 10^2 at a certain temperature. If [ SO2 ]^2 = 0.0124M and [ O2 ] = 0.031M, what is [SO2]
Two common substances that are used in the northern U.S. to melt snow and ice are sodium choride (rock salt) and calcium chloride. You have a bag of a substance sold as melting salt
7.50 mL of 0.125 M HCl is added to the 100.0 mL of the buffer solution. Calculate the new [NH3] and [NH4Cl] for the buffer solution. Calculate the new pH of the solution.
to obtain the same antifreeze protection requires 76g of propylene glycol to replace each 62g of ethylene glycol.
How many grams of chlorine gas must be reacted with excess sodium iodide if 20.0 moles of sodium chloride are needed?
In an industrial preparation of silicon, 155.3kg of SiO2 of is allowed to react with 79.3kg of carbon to produce 66.2kg of silicon. What is the theoretical yield for the reaction in Kg Si
According to NMR spectra rules, a carbon that is more substituted is more deshielded. For some reason I cannot understand this, because in my mind I see it has more shielding since there is more electron density around it. Please explain in detail..
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