Chemistry
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Epinephrine (adrenaline) is 59.0% carbon, 7.1% hydrogen, 26.2% oxygen, and 7.7% nitrogen by mass. What is the empirical formula of epinephrine if its molar mass is 180 g/mol?

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(1) Answers
longhornlova12

For the answer to the question above, 590 g C, 71 g H, 262g O, 77 g N.  Using the molar masses of these elements, we see that there is:  49.126 mol C, 70.297 mol H, 16.375 mol O, 5.497 mol N.  Dividing through the one with the least amount of mols (N):  8.937 mol C, 12.788 mol H, 2.979 mol O, 1 mol N  We can round these off to get that the empirical formula is C₉H₁₃NO₃.  We see that:  Molar mass of C₉H₁₃NO₃  = 9*Molar mass of C + 13*Molar mass of H + Molar Mass of N + 3*Molar mass of O  = 9 * 12.01 g/mol + 13 * 1.01 g/mol + 14.01 g/mol + 3 * 16 g/mol  The answer is = 183.23 g/mol. 

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