( ( is ( ( ( ( a gas ) ( at ( room temperature ) ) ) , ) ( in ( spite ( of ( ( hydrogen sulfide ) ( having ( ( ( nearly ( two times ) ) ( the ( molar mass ) ) ) ( of water ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VBZ is) (NP (NP (DT a) (NN gas)) (PP (IN at) (NP (NN room) (NN temperature))) (, ,) (PP (IN in) (NP (NP (NN spite)) (PP (IN of) (NP (NP (NN hydrogen) (NN sulfide)) (VP (VBG having) (NP (NP (QP (RB nearly) (CD two) (NNS times)) (DT the) (NN molar) (NN mass)) (PP (IN of) (NP (NN water))))))))))) (. .)))
is a gas at room temperature, in spite of hydrogen sulfide having nearly two times the molar mass of water.
(ROOT (S (NP (NNP Hydrogen)) (VP (VBZ is) (PP (IN in) (NP (NP (NN gas) (NN form)) (PP (IN at) (NP (NN room) (NN temperature)))))) (. .)))