please help me wt the ff: a. Calculate the concentration (g/mL) of acrolein [CH2=CHCHO] that should be prepared in order

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please help me wt the ff:
a. Calculate the concentration (g/mL) of acrolein [CH2=CHCHO]
that should be prepared in orderto give an absorbance of 0.8 at 217
nm ( = 16,000).
b. Propose a structure for C7H4O2Cl2, as an acid with λmax 242
nm.
c. Describe briefly the steps in obtaining the
spectrum of a sample using Thermo Scientific Nicolet IS5 FT-IR
Instrument starting from loading the solid and liquid samples.