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E1% 1cm (absorptivity) of paracetamol is 740 and molecular weight is 151.6 than calculate molar absorption cofficient, * o 1121.84 o 11218.4 o112.184 o none of these
Accepted Answer
The molar absorptivity (ε) can be calculated using the following formula:
ε = (A / (b
c))
Where:
A is the absorbance (E1% 1 cm, which is the absorbance of a 1% solution in a 1 cm cuvette)
b is the path length (1 cm)
c is the concentration (in mol/L)
First, convert the E1% 1 cm value to absorbance:
E1% 1 cm = 740
Convert the percentage concentration to molar concentration:
1% = 1 g/100 mL = 10 g/L
Concentration (mol/L) = (10 g/L) / (151.6 g/mol) = 0.066 mol/L
Now, calculate the molar absorptivity:
ε = (740 / (1 cm
0.066 mol/L)) = 11212.12 L/(mol
cm)
Therefore, the closest answer is 11218.4. However, the exact calculation yields a slightly different value.
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