An iron cube measures 10cm X 10cm X 10cm. What is its volume?

As you move from right to left on the periodic table the atomic radius fill in the blank

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

How do you determine the percent yield of a chemical reaction