7. Plants selectively synthesize alkanes with an odd number of carbon atoms. The concentration of C29H60 in summer rainwater collected in Hannover, Germany is 23 μM. How many ppm of C₂₉H₆₀ are in 23 μM C₂₉H₆₀? (The molecular mass of C29H60 is 408.8 g/mol.)
(A) 0.023 ppm
(B) 23 ppm
(C) 9.4 ppm
(D) 0.0094 ppm
(E) None of the above

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