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A solution containing 1.0 mg of Iron in 100 ml was observed to transmit 70% of...

A solution containing 1.0 mg of Iron in 100 ml was observed to transmit 70% of the incident light compared to an appropriate blank.

a) What is the absorbance of the solution?

b) What fraction of light would be transmitted by a solution of Iron 4 times this solution?


Answer for (a) is obtained by this formula ( A=2-log(%T) ) which results A=0.155

Please explain part (b)
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