Ammonium hydrogen sulfide (NH4HS) can decompose to ammonia and hydrogen sulfide: Upper N upper H subscript 4 upper H upper S (s) double-headed arrow upper N upper H subscript 3 (g) plus Uppe H subscript 2 upper S (g). What is the equilibrium constant expression for this system? K subscript e q equals StartFraction StartBracket upper N upper H subscript 3 EndBracket StartBracket upper H subscript 2 upper s EndBracket over StartBracket upper N upper H subscript 4 upper H upper S EndFraction. K subscript e q equals StartBracket upper N upper H subscript 3 EndBracket StartBracket upper H subscript 2 upper s EndBracket. K subscript e q equals StartFraction 1 over StartBracket upper N upper H subscript 3 EndBracket StartBracket upper H subscript 2 upper s EndBracket EndFraction.