( It ( ( ( is not ) ( ( proper ( , ( however , ) ) ) ( to ( ( use ( the ( term mole ) ) ) ( for ( a ( heterogeneous ( or ( homogeneous mixture ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (RB not) (ADJP (JJ proper) (PRN (, ,) (ADVP (RB however)) (, ,)) (S (VP (TO to) (VP (VB use) (NP (DT the) (NN term) (NN mole)) (PP (IN for) (NP (DT a) (JJ heterogeneous) (CC or) (JJ homogeneous) (NN mixture)))))))) (. .)))
It is not proper, however, to use the term mole for a heterogeneous or homogeneous mixture.
(ROOT (S (NP (NNS Heterogeneous)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (DT a) (NN mixture)) (SBAR (WHNP (WDT that)) (S (VP (VBZ varies) (PP (IN in) (NP (PRP$ its) (NN composition)))))))))) (. .)))