( ( Because ( ( at ( standard ( ( temperature and ) pressure ) ) ) ( ( carbon dioxide ) ( is ( a gas ) ) ) ) ) ( , ( ( the ( carbon dioxide ) ) ( ( ( ( ( sublimates and ) ( instantly ( produces ( a gas ) ) ) ) , ) ( ( ( condensing ( water vapor ) ) and ) ( creating ( a ( thick ( white fog ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Because) (S (PP (IN at) (NP (JJ standard) (NN temperature) (CC and) (NN pressure))) (NP (NN carbon) (NN dioxide)) (VP (VBZ is) (NP (DT a) (NN gas))))) (, ,) (NP (DT the) (NN carbon) (NN dioxide)) (VP (VP (VBZ sublimates)) (CC and) (VP (ADVP (RB instantly)) (VBZ produces) (NP (DT a) (NN gas))) (, ,) (S (VP (VP (VBG condensing) (NP (NN water) (NN vapor))) (CC and) (VP (VBG creating) (NP (DT a) (JJ thick) (JJ white) (NN fog)))))) (. .)))
Because at standard temperature and pressure carbon dioxide is a gas, the carbon dioxide sublimates and instantly produces a gas, condensing water vapor and creating a thick white fog.
(ROOT (S (NP (NP (DT The) (NN combustion)) (PP (IN of) (NP (NN propane) (NN gas)))) (VP (VBZ produces) (NP (NP (NN carbon) (NN dioxide)) (CC and) (NP (NN water) (NN vapor)))) (. .)))