( ( ( ( ( ( ( The osmolality ) ( of ( a ( pure solvent ) ) ) ) ( is zero ) ) , ) but ) ( ( if ( ( ( one mole ) ( of ( ( osmotically active ) ( nonelectrolyte particles ) ) ) ) ( is ( added ( to ( ( one kilogram ) ( of solvent ) ) ) ) ) ) ) ( , ( ( the ( end product ) ) ( is ( a ( one ( osmolal solution ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (DT The) (NN osmolality)) (PP (IN of) (NP (DT a) (JJ pure) (NN solvent)))) (VP (VBZ is) (NP (CD zero)))) (, ,) (CC but) (S (SBAR (IN if) (S (NP (NP (CD one) (NN mole)) (PP (IN of) (NP (ADJP (RB osmotically) (JJ active)) (NN nonelectrolyte) (NNS particles)))) (VP (VBZ is) (VP (VBN added) (PP (TO to) (NP (NP (CD one) (NN kilogram)) (PP (IN of) (ADJP (JJ solvent))))))))) (, ,) (NP (DT the) (NN end) (NN product)) (VP (VBZ is) (NP (DT a) (CD one) (NN osmolal) (NN solution)))) (. .)))
The osmolality of a pure solvent is zero, but if one mole of osmotically active nonelectrolyte particles is added to one kilogram of solvent, the end product is a one osmolal solution.
(ROOT (S (NP (NNP Osmolality)) (VP (VBZ is) (NP (NP (DT the) (NN ratio)) (PP (IN of) (NP (NP (NNS solutes)) (PP (IN in) (NP (NP (DT a) (NN solution)) (PP (TO to) (NP (NP (DT a) (NN volume)) (PP (IN of) (ADJP (JJ solvent))))))))) (PP (IN in) (NP (DT a) (NN solution))))) (. .)))