( ( ( ( Relative ( molecular mass ) ) ( ( The sum ) ( of ( the ( relative ( atomic masses ) ) ) ) ) ) ( of ( ( the elements ) ( in ( a compound ) ) ) ) ) . )
(ROOT (NP (NP (JJ Relative) (JJ molecular) (NN mass)) (NP (NP (DT The) (NN sum)) (PP (IN of) (NP (DT the) (JJ relative) (JJ atomic) (NNS masses)))) (PP (IN of) (NP (NP (DT the) (NNS elements)) (PP (IN in) (NP (DT a) (NN compound))))) (. .)))
Relative molecular mass The sum of the relative atomic masses of the elements in a compound.
(ROOT (S (NP (NP (DT The) (NN sum)) (PP (IN of) (NP (NP (DT the) (NNS masses)) (PP (IN of) (NP (NP (DT the) (NNS atoms)) (PP (IN in) (NP (DT the) (NN formula)))))))) (VP (VBZ is) (VP (VBN referred) (PP (TO to) (NP (RB as) (JJ molecular) (NN mass))))) (. .)))