Menthol, the substance we can smell in mentholated...

Question

Menthol, the substance we can smell in mentholated cough drops, is composed of C, H, and O. A 0.1005-g sample of menthol is combusted, producing 0.2829 g of CO₂ and 0.1159 g of H₂O. What is the empirical formula
for menthol?

If the compound has a molar mass of 156 g/mol, what is its molecular formula?

Jules Bruno · Accepted Answer

Step 1: The reaction would be: CxHyOz + O2 → CO2 + H2OThe mass of C and H:Mass C=0.2829 g CO2×1 mol CO244.01 g CO2×1 mol C1 mol CO2×12.01 g C1 mol C[readmore] Mass C = 0.07720 g CMass H=0.1159 g H2O×1 mol H2O18.02 g H2O×2 mol H1 mol H2O×1.01 g H1 mol H Mass H = 0.01299 g HStep 2. Mass of OTotal Mass=Mass C+Mass H+Mass O0.1005 g=0.07720 g +0.01299 g+Mass O0.1005 g=0.09019 g+Mass OMass O=0.1005 g-0.09019 g Mass O = 0.01031 gStep 3. The atomic masses are 12.01 g C, 1.01 g/mol H, and 16.00 g/mol O.0.07720 g C×1 mol C12.01 g C= 0.0064 mol C0.01299 g H×1 mol H1.01 g H= 0.01286 mol H0.01031 g O×1 mol O16.00 g O= 0.000644 mol OStep 4: Get the smallest ratio of C, H, and O.0.0064 mol C0.000644= 10 C0.01286 mol H0.000644= 20 H0.000644 mol O0.00064= 1 OThe empirical formula of methanol is C10H20O.Step 5. The empirical mass of C10H20O is 156 g/mol.Molecular MassEmpirical Mass=156 g156 g=1The molecular formula of methanol is C10H20O.

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