29. When elemental iron corrodes it combines with oxygen in the air to ultimately form red brown iron(III) oxide called rust.
(a) If a shiny iron nail with an initial mass of 33.8 g is weighed after being coated in a layer of rust, would you expect the mass to "increase", "decrease", or *remain the same"? Explain.
(b) If the mass of the iron nail increases to 34.9 g, what mass of oxygen combined with the iron in part a?
