( ( ( ( Calculating % ) Composition ) ( -LRB- ( ( from ( masses ( of ( each element ) ) ) ) -RRB- ) ) ) ( ( ( ( ( divide ( ( the mass ) ( of ( each element ) ) ) ) ( by ( ( the ( total mass ) ) ( of ( the compound ) ) ) ) ) and ) ( multiply ( by ( 100 IV ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (CD Calculating) (NN %)) (NP (NNP Composition))) (PRN (-LRB- -LRB-) (PP (IN from) (NP (NP (NNS masses)) (PP (IN of) (NP (DT each) (NN element))))) (-RRB- -RRB-))) (VP (VP (VBP divide) (NP (NP (DT the) (NN mass)) (PP (IN of) (NP (DT each) (NN element)))) (PP (IN by) (NP (NP (DT the) (JJ total) (NN mass)) (PP (IN of) (NP (DT the) (NN compound)))))) (CC and) (VP (VB multiply) (PP (IN by) (NP (QP (CD 100) (CD IV)))))) (. .)))
Calculating % Composition (from masses of each element) divide the mass of each element by the total mass of the compound and multiply by 100 IV.
(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)))))))) (. .)))