( Trost ( ( defines ( ( ( the ( atom economy ) ) ( of ( a chemical ) ) ) ( processes ( as ( ( the ( atomic mass ) ) ( of ( product ( divided ( by ( ( the ( the ( atomic mass ) ) ) ( of ( all reactants ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Trost)) (VP (VBZ defines) (SBAR (S (NP (NP (DT the) (NN atom) (NN economy)) (PP (IN of) (NP (DT a) (NN chemical)))) (VP (VBZ processes) (PP (IN as) (NP (NP (DT the) (JJ atomic) (NN mass)) (PP (IN of) (NP (NP (NN product)) (VP (VBN divided) (PP (IN by) (NP (NP (DT the) (DT the) (JJ atomic) (NN mass)) (PP (IN of) (NP (DT all) (NNS reactants)))))))))))))) (. .)))
Trost defines the atom economy of a chemical processes as the atomic mass of product divided by the the atomic mass of all reactants.
(ROOT (S (NP (NNS Atoms)) (VP (VBP make) (NP (NNS products)) (PP (IN by) (S (VP (VBG rearranging) (NP (PRP$ their) (NN chemical) (NNS bonds)) (PP (IN in) (NP (DT a) (NN reactant))))))) (. .)))