How many grams of H2S are needed if I want 21.0 g of SO2?

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.

What is the empirical formula for c4h8o2

Which statement best describes the flow of energy in this scenario