Asolution has a ph of 2.5. what is its [oh-] ?

3.2 x 10-3

3.2 x 10-12

3.2 x 10-2

11.5

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