see problem below... Below is a graph of concentration changes over time (minute

Question

see problem below...

Below is a graph of concentration changes over time (minutes) during processing in liquid water. Each of the three molecules below contributes a different flavor to coffee. Presume the cincentration units for the y-axis (the ordinate) is mch 10mL-1. Answer the question below the graphs. After 11 minutes of processing which molecule is found in the smallest concentration (expressed in molarity, M)? Show all three calculations with correct units for full credit. Attach an extra sheet if needed. Answer:

Explanation / Answer

MW of pyridine = 79gm

MW of pyrazine = 80gm

MW of phenol = 94gm

moles of pyrideine after 11min = 11 x 10^-6 /79 = 1.39 x 10^-7 moles/mL = 1.39 x 10^-4 M

moles of pyrazine after 11min = 6 x 10^-6 /80= 0.75 x 10^-7 moles/mL = 0.75 x 10^-4 M

moles of phenol after 11min = 4 x 10^-6 /94 = 0.42 x 10^-7 moles/mL = 042 x 10^-4 M

So phenol has least conc

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