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Calculate the H+ concentration in a .02M solution of a moderately strong acid HA where the Ka is 3.0x10^-2 and the degree of dissociation of the acid
the freezing point of pure camphor is 178.4 degrees C, and its molal freezing-point constant, Kf, is 40.0 degrees C/m. Find the freezing-point of a solution containing 3.00 g of a compound (molar mass=125 g/mol) dissolved in 45.0 g of camphor
Calculate the values for Z1 and Z11 for mercury (Hg) vapor at 40 degrees C at P = 0.10 atm. How does this quantity depend on pressure
A 24.0 g sample of nitrogen gas reacts with an excess of hydrogen gas to give an actual yield of 3.85 g NH3. What is the percent yield for this reaction? Reaction: N2(g) + 3 H2(g) ? 2 NH3(g)
An unknown element forms a yellow ion, XO . It forms a precipitate with silver ions. If 48.0 mL of a 0.250 mol/L solution of silver ions is added to a solution of the unknown ion, 1.856g of a red-brown precipitate are formed. Determine the iden..
How many grams of formic acid, HCOOH, must be added to 0.300 L of 0.190 M sodium formate, HCOONa, to yield a buffer solution with a pH of 4.00? Assume no volume change. Ka of HCOOH = 5.0 10-4.
Calculate the approximate volume of 0.02M KMnO4 (in the unit of mL) needed to titrate 0.17 g sodium oxalate.(Note: The KMnO4 solution will be added from a buret to a flask during titration.
what is the heat flow of hot water added to cold water? What is the heat flow of the cold water? hot water was 52.5 C the cold water was 21.7 C the final temperature was mass of cold water was 49.35g
Determine the pressure (in atm) inside the can if a metal can of 1.00 qt contains 0.150 grams of Helium at a temperature of 20 degrees Celsius also explain Is this pressure greater or less than standard atmospheric pressure?
Calculate the fraction of atom sites that are vacant for lead at its melting temperature of 327C
Benzene has a heat of vaporization of 30.72 kJ/mol and a normal boiling point of 80.1 C. At what temperature does benzene boil when the external pressure is 480 torr?
Given a relative reactivity of 5.0:3.5:1.0 (tertiary:secondary:primary) hydrogens,calculate the expected percentage of each of the three reaction products expected in the chlorination of n-pentane?
Radio waves travel at the speed of light which is 3x10^8 m/s. how many kilometers will radio messages to outer space travel in one year
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