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A solution of ethyl acetate and sodium hydroxide was prepared at t=0 at 5*10-3 mol/L ethyl acetate and 8*10-3 mol/L of sodium hydroxide. After 400 second at 25 deg.c, 25ml of aliquot was found to neutralize 33.3ml of 5*10-3 mol/L of HCl.
a) What is the rate constant for the second order reaction and
b) At what time would you expect 20ml of hydrochloric acid to be required?
What is the mass of 3.20 moles of magnesium chloride,MgCl2 ? Express your answer with the appropriate units. mass of MgCl2 =
Complete combustion of 6.00 g of a hydrocarbon produced 19.3 g of CO2 and 6.58 g of H2O. What is the empirical formula for the hydrocarbon?
Explain how many grams of silver(I) nitrate are required to react completely with 99 mL of 0.85 M hydrochloric acid solution to form silver chloride solid
Calculate the solubility (in M units) of ammonia gas in water at 298 K and a partial pressure of 9.00 bar . The Henrys law constant for ammonia gas at 298 K is 58.0 M/atm
Given 174 mL of a buffer solution that is 0.23 M formic acid and 0.28 M sodium formate, calculate the pH of this solution after the addition of 1.93 mL of 5.2 M sodium hydroxide. The Ka of formic acid is 1.8x10-4
The equilibrium constant Kp for the reaction ; CCl4(g) C(s) + 2Cl2(g) at 700 celcius is 0.76 atm. Determine the initial pressure of carbon tetrachloride
Problem- An artifact has a carbon-14 decay rate of 7.94 disintegrations per minute per gram of carbon (7.94 dis/min?gC). Living organisms have carbon-14 decay rate of 15.3 dis/min?gC. How old is the artifact? (The half-life of carbon-14 is 5730 yr..
To resolve an object in an electron microscope, the wavelength of the electrons must be close to the diameter of the object. What kinetic energy must the electrons have in order to resolve a protein molecule
When 17 mL of a solution containing .29 M Ca(OH)2 is diluted to 30 mL, a dilute solution is formed. What is the OH- concentration in 5 mL of the dilute solution?
The density of air at ordinary atmospheric pressure and 25 0C is 1.19 g/L. What is the mass of air, in kg, in a room that measures 12.5 ft by 15.5 ft by 8.0 ft?
A 0.0560-g quantity of acetic acid is dissolved in enough water to make 50.0 mL of solution. Calculate the concentrations of H+, CH3COO-, and CH3COOH at equilibrium. (Ka for acetic acid = 1.8 x 10^-5).
What pH is needed such that the maximum [Mg^2+] is solution is 2x10^-4M given the equilibrium: Mg(OH)2(s) Mg^(2+) + 2OH^- also pK(sp)=8.3
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