I need to know all of these questions and they need to be worked out step-by-step. Thank you so much

The most efficient way to establish the best possible economizer position is to measure

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

Areaction is first order with respect to reactant x and second order with respect to reactant y. which statement describes the rate law for this reaction?