Answer:
Problem 34P
Menthol (ℳ= 156.3 g/mol). a strong-smelling substance used in cough drops, is a compound of carbon, hydrogen, and oxygen. When 0.1595 g of menthol was subjected to combustion analysis, it produced 0.449 g of CO2, and 0.184 g of H2O. What is menthol's molecular formula?
Step-by-Step Solution:
Solution 34P
Here, we have to calculate the molecular formula of Menthol.
Step 1 of 3
First, let’s find the molar mass of individual elements in Menthol.
Mass of Carbon = Mass of CO2
We know,
Mass of CO2 = 0.449g
Molar mass of C = 12.01 g
Mass of 1 mol of CO2 = 44.01g
= 0.122g.
Therefore, mass of carbon is 0.122g.
Mass of Hydrogen = Mass of H2O
We know,
Mass of H2O = 0.184g
Molar mass of H = 2.016g
Mass of 1 mol of H2O = 18.02g.
= 0.020g.
Therefore, mass of Hydrogen is 0.020g.
Mass of O = Mass of Menthol - (Mass of C + Mass of H).
We know,
Mass of menthol = 0.1595 g
Mass of C = 0.122g
Mass of H = 0.020 g
= 0.1595g - ( 0.122 g + 0.020 g)
= 0.1595g - 0.142 g
= 0.0175 g.
Therefore mass of O is 0.0175g.
