What is the correct equilibrium constant expression for this equation? 2 upper C l subscript 2 (g) plus 2 upper H subscript 2 upper O (g) double arrow 4 upper H upper C l (g) plus upper O subscript 2 (g). k subscript e q equals StartFraction StartBracket upper h upper C l EndBracket StartBracket upper O subscript 2 EndBracket over StartBracket upper C l subscript 2 EndBracket StartBracket upper h subscript 2 upper O EndBracket EndFraction. k subscript e q equals 4 StartFraction 4 StartBracket upper H upper C l EndBracket StartBracket upper O subscript 2 EndBracket over 2 StartBracket upper C l subscript 2 EndBracket 2 StartBracket upper H subscript 2 upper O EndBracket EndFraction. k subscript e q equals 4 StartFraction StartBracket upper H upper C l EndBracket StartBracket upper O subscript 2 EndBracket over StartBracket upper C l subscript 2 EndBracket superscript 2 StartBracket upper H subscript 2 upper O EndBracket superscript 2 EndFraction.