Why is helium so difficult to liquefy?

Select the correct answer. which phrase correctly describes temperature? o a. average rotational kinetic energy of the particles in an object o b. average energy of the particles in an object c. average translational kinetic energy of the particles in an object od. all energy possessed by the particles in an object

Based on the equation and the information in the table, what is the enthalpy of the reaction?

Element before carbon on the periodic table