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why KF is a better reagent than LiF for the replacement of chlorine in organic compounds by the autoclave reaction
the diprotic acid H2B is being titrated against .04M NaOH. H2B has 40mL, .2M concentration, Ka1+2.5*10^-3, Ka2=3*10^-10. What are the concentrations of each species in the following pts in the titra
A sample of gas has a mass of 38.7mg . Its volume is 224mL at a temperature of 57 degrees Celsius and a pressure of 868torr . Find the molar mass of the gas.
Calculate delta H of this reaction. Assume that the total volume is the sum of the individual volumes and the density and specific heat capacity of the solution are the same as for pure water. d for
A 23.7-g sample of ethylene glycol, a car radiator coolant, loses 906 J of heat. What was the initial temperature of the ethylene glycol if the final temperature is 32.5 degrees Celsius (c of ethyle
Calculate q when 15.8 g of ice is cooled from -22.4 degrees Celsius to -71.0 degrees Celsius (C ice = 2.087 J/g*K)
Consider titrating 15.0ml of a .245M solution of hydazine, H2NNH2, with a .453M HCl solution. The Kb value for hydrazine is 1.3x10^-6. What volume of HCl needs to be added to the solution in oder to
The pH of an aqueous solution containing only a monoprotic weak acid has a pH of 4.1. What is the concentration of hydronium ion, H3O+, in the solution? (a)2 x 10?3 M (b)2 x 10?4 M (c)8 x 10?4 M (d)
If you compare two acids of the same concentration with different Ka values. Which acid solution should have the lower pH value
Liquid benzene, C6H6, (density = 0.877 g/mL) can be used as a fuel. What is ?H in kJ for the combustion of 2.86 L of benzene producing CO2(g) and H2O. Assume that the heat of combustion of benzene i
The combustion of carbon with excess oxygen forming carbon dioxide is exothermic. C(s) + O2(g) => CO2(g) ?Hrxn = -393 kJ If 9,494kJ of heat is needed from the combustion, how much carbon (g) must
2C8H18(l) + 25O2(g) => 16CO2(g) + 18H2O(l) ?H = -11,200. kJ Standard enthalpies of formation, ?Hf: CO2(g), -393.5 kJ/mol; H2O(l), -285.8 kJ/mol Use the above data to calculate the standard enthal
the assumption that the entropies of deprotonation of the ground and excited state 2-naphthol molecules are equal.
If the entropy of a collection of molecules in 50,000 boxes is 3.73E-20 J/K, how many molecules are there
what is the pH of the solution after the addition of 3.0 ml of HCl? e) What is the pH of the solution at the equivalence point? f) what is the pH of the solution when 5.0ml more of the HCl solution
Give the common name for the following compound: 2,2-dimethyloct-3-yne CH3-C?C-CH2-CH2-CH2-CH3
Calculate the mass of emitted into the atmosphere upon accelerating the from 0.0 to 67.0 . Assume that the required energy comes from the combustion of octane with efficiency.
Vitamin D3 Vitamins are chemicals required by humans in small amounts and are not made within our bodies. Such chemicals must therefore be acquired from ones diet.
What fraction of piperazine (perhydro-1,4-diazine) is in each of its three forms (H2A, HA-, A2-) at pH 8.44
Many power plants produce energy by burning carbon-based fuels, which also produces carbon dioxide. Carbon dioxide is a greenhouse gas, so over-production can have negative effects on the environmen
Why do use slightly different amounts of acids (HCL and NaHSO4) from the amounts of base (NaOH). In what order should you mix the acid and base
Assuming the mixture has the same specific heat (4.184J/goC) and density (1.00 g/cm3 or 1.00 g/mL) as water, calculate the heat (in J) transferred to the surroundings, qsurr.
Which one of these equations describes a redox reaction? 2Al+3H2SO4(aq)-->Al2(SO4)3(aq)+3H2(g), 2KBr(aq)+Pb(NO3)2(aq)-->2KNO3(aq)+PbBr2(s), CaBr2(aq)+H2SO4(aq)-->CaSO4(s)+2HBr(g), H+(aq)+O
What is the pH of a 0.440 ammonia solution? with the kb value of 1.8*10^-5 What is the percent ionization of ammonia at this concentration. Express the percentage numerically to three significant f
A mixture of 3.0 g of 1,1-diphenylethylene and 100 mg of sulfuric acid was heated for 2 hours. Upon cooling, 2.2 grams of crystalline 1,1,3,3-tetraphenyl-3-methyl-1-butene precipitated from the mixt