What is its concentration?

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Posted on : 21-05-2014 | By : My Study Coach | In : Improve Your Concentration
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If a solution of [M_o(NH_3)_6] Cl_3 has an absorbance of 1.21 when measured in a cell with a path lenght of 1.20 cm, what is it’s concentration? The molar absorptivity at the wavelenght at which the measurement was obtained is 130 M^-1 cm^ -1

_# means that # is a subscript

^# means that # is a power
If a solution of [Mo(NH_3)_6] Cl_3 has an absorbance of 1.21 when measured in a cell with a path lenght of 1.20 cm, what is it’s concentration? The molar absorptivity at the wavelenght at which the measurement was obtained is 130 M^-1 cm^ -1

_# means that # is a subscript

^# means that # is a power

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Comments (1)

Well, absorbance, A, is defined as (molar absorptivity or extinction coefficient)*(concentration)*(path length). So now we have:
1.21 = (130 /M·cm)(concentration)(1.20 cm)
Therefore:
concentration = 1.21/(130*1.20) = 0.00776 (M)

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