Consider the titration of a 25.0-ml sample of 0.175m ch3nh2 with 0.150 m hbr. determine each quantity. a. the initial ph b. the volume of added acid required to reach the equivalence point c. the ph at 5.0 ml of added acid d. the ph at one-half of the equivalence point

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

Air can be considered a mixture. which statement does not explain why?

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3