( ( The ( percents given ) ) ( ( are ( ( the ( mass ratios ) ) ( of ( ( each element ) ( per ( ( 100 g ) ( of compound ) ) ) ) ) ) ) ; ) )
(ROOT (S (NP (DT The) (NN percents) (VBN given)) (VP (VBP are) (NP (NP (DT the) (JJ mass) (NNS ratios)) (PP (IN of) (NP (NP (DT each) (NN element)) (PP (IN per) (NP (NP (CD 100) (NN g)) (PP (IN of) (NP (NN compound))))))))) (: ;)))
The percents given are the mass ratios of each element per 100 g of compound;
(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)))))))) (. .)))