( ( ( 2 -RRB- ) ( ( A reaction ) ( in ( which ( there ( is ( ( an increase ) ( in ( ( the number ) ( of ( moles ( of gas ) ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (NP (NP (LST (LS 2) (-RRB- -RRB-)) (NP (DT A) (NN reaction)) (PP (IN in) (SBAR (WHNP (WDT which)) (S (NP (EX there)) (VP (VBZ is) (NP (NP (DT an) (NN increase)) (PP (IN in) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS moles)) (PP (IN of) (NP (NN gas))))))))))))) (. .)))
2) A reaction in which there is an increase in the number of moles of gas.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (PRP you)) (VP (VBP add) (NP (NP (NNS moles)) (PP (IN of) (NP (NP (NN gas)) (PP (TO to) (NP (DT a) (NN baloon)))))) (PP (IN by) (S (VP (VBG blowing) (NP (PRP it)) (PRT (RP up)))))))) (, ,) (NP (DT the) (NN volume)) (VP (VBZ increases)) (. .)))