The UV spectrum of acetone (c = 0.050 M in cyclohexane, l = 1cm cell) shows ?max

Question

The UV spectrum of acetone (c = 0.050 M in cyclohexane, l = 1cm cell) shows ?max at 279 nm with an absorbance of 0.74.  What is the molar absorptivity of acetone at this wavelength? (? = A/c*l)
    
          a.            0.068                             b.            14.8                             c.            0.0027                             d.            0.053
The UV spectrum of acetone (c = 0.050 M in cyclohexane, l = 1cm cell) shows ?max at 279 nm with an absorbance of 0.74.  What is the molar absorptivity of acetone at this wavelength? (? = A/c*l)
    
          a.            0.068                             b.            14.8                             c.            0.0027                             d.            0.053
The UV spectrum of acetone (c = 0.050 M in cyclohexane, l = 1cm cell) shows ?max at 279 nm with an absorbance of 0.74.  What is the molar absorptivity of acetone at this wavelength? (? = A/c*l)
    
          a.            0.068                             b.            14.8                             c.            0.0027                             d.            0.053
0.068 14.8 0.0027 0.053     
          a.            0.068                             b.            14.8                             c.            0.0027                             d.            0.053

Explanation / Answer

B) 14.8

Note that.

? = A/c*l) ----> ? = 0.74/[(0.05M)*1]= 0.74/0.05=14.8

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