English Vocabulary Flash Cards - Chemical Formulas @ englishpdf.com and englishteststore.com File 157 MoS2 molybdenum disulfide Hg2Br2 mercury(I) bromide NH2− amide ion NH2CH2CH2NH2 ethylenediamine NH2CONH2 urea NH2C6H4SO3H sulfanilic acid NH2OH hydroxylamine (NH2)2CO urea