If there are 7.2 mol of h, how many moles of each do the following compounds are present? h2so4

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

Citric acid has a ph between 1 and 3.  it is considered to be aa. weak acidb. weak basec. strong based. strong acid

Which of the following is a physical change? a.burning a piece of wood b.sawing a piece of wood in half c.rust forming on an iron fence d.a copper roof changing color from orange to green