Type the foSuppose you had one mole of oxygen (O2). How many moles of hydrogen (H2) would react completely with the oxygen, and how many moles of H2O would be producedrmula “H2” into the Reactants box. What is the molar mass of hydrogen gas, H2

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.

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)

Which of the following are sources of revenue for media companies? a. direct sales to producers b. advertising and subscriptions c. online purchase d. capital investments