How many grams of potassium hydroxide would be needed to make 1000 mL of a 3.5 M potassium hydroxide solution

What is the name of this hydrocarbon?

What type of electromagnetic radiation has a shorter wavelength than blue light

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