What is the molar absorbance constant of cobalt II chloride?
a) 55 , L mol⁻¹ , cm⁻¹
b) 75 , L mol⁻¹ , cm⁻¹
c) 85 , L mol⁻¹ , cm⁻¹
d) 95 , L mol⁻¹ , cm⁻¹

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