Question

Determine the empirical and molecular formulas of each of the following substances

Part A

Ibuprofen, a headache remedy, contains 75.69% C, 8.80% H, and 15.51% O by mass, and has a molar mass of 206 g/mol.

Express your answers as chemical formulas separated by a comma.

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Part B

Cadaverine, a foul smelling substance produced by the action of bacteria on meat, contains 58.55% C, 13.81% H, and 27.40% N by mass; its molar mass is 102.2 g/mol.

Express your answers as chemical formulas separated by a comma.

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Part C

Epinephrine (adrenaline), a hormone secreted into the bloodstream in times of danger or stress, contains 59.0%C, 7.1% H, 26.2% O, and 7.7% N by mass; its MW is about 180 amu.

Express your answers as chemical formulas separated by a comma.

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Answer 1

Part A

Number of moles of C present in 1 mole of Ibuprofen

Number of moles of H present in 1 mole of Ibuprofen

Number of moles of O present in 1 mole of Ibuprofen

Hence, the molecular formula of Ibuprofen is .

This is also equal to its empirical formula.

Part B

Number of moles of C present in 1 mole of Cadaverine

Number of moles of H present in 1 mole of Cadaverine

Number of moles of N present in 1 mole of Cadaverine

Hence, the molecular formula of Cadaverine is .

This is also equal to its empirical formula.

Part C

Number of moles of C present in 1 mole of Epinephrine (adrenaline)

Number of moles of H present in 1 mole of Epinephrine (adrenaline)

Number of moles of O present in 1 mole of Epinephrine (adrenaline)

Number of moles of O present in 1 mole of Epinephrine (adrenaline)

Hence, the molecular formula of Epinephrine (adrenaline) is .

This is also equal to its empirical formula.