Graphically find the concentration in ppm and then calculate in mol/L of Soda #1 and Soda #2?

Introductory Chemistry For Today
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Chapter7: Solutions And Colloids
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Caffeine Std (ppm) Absorbance (270 nm)
1 0.179
2 0.39
3 0.673
4 0.787
   
Soda #1 0.233
Soda #2 0.417

Graphically find the concentration in ppm and then calculate in mol/L of Soda #1 and Soda #2?

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