What is the mass of a 7.91 cm cubed piece of lead having a density of 11.34 g/cm cubed

Which statement describes both homogeneous mixtures and heterogeneous mixtures?

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

What is the mass of 8 moles of sodium atoms