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. menthol has a molar mass of 156.27 g/mol. what is the molecular formula of menthol?

Explanation:

In a combustion experiment, all the carbon ends up as CO₂, and all the hydrogen ends up as water.

Data:

Mass of menthol = 0.1005 g

     Mass of CO₂ = 0.2829 g

     Mass of H₂O = 0.1159   g

Calculations:

(a) Mass of each element

(b) Moles of each element

(c) Molar ratios

Divide all moles by the smallest number of moles.

(d) Round the ratios to the nearest integer

C:H:O = 10:20:1

(e) Write the empirical formula

The empirical formula is C₁₀H₂₀O.

(f) Calculate the empirical formula mass

 10 × C = 10 × 12.01  = 120.1    u

20 × H = 20 × 1.008 =  20.16  u

  1 × O = 1 × 16.00    =   16.00 u

                EF  mass =  156.3    u

(g) Divide the molecular mass by the empirical formula mass.  

(h) Determine the molecular formula

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