( ( analyze ( ( percent composition ) ( of ( ( the elements ) ( in ( ( ( a compound ) , ) ( given ( the formula ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB analyze) (NP (NP (NN percent) (NN composition)) (PP (IN of) (NP (NP (DT the) (NNS elements)) (PP (IN in) (NP (NP (DT a) (NN compound)) (, ,) (VP (VBN given) (NP (DT the) (NN formula))))))))) (. .)))
analyze percent composition of the elements in a compound, given the formula.
(ROOT (S (NP (DT The) (NN term) (NN percent) (NN composition)) (VP (VBZ means) (NP (DT the) (NN percentage)) (PP (IN by) (NP (NP (NN mass)) (PP (IN of) (NP (NP (DT each) (NN element)) (PP (IN in) (NP (DT a) (NN compound)))))))) (. .)))