Question

The compound A has the percentage composition by following mass: Carbon 26.7%, Oxygen = 71.1%, Hydrogen = 2.2%. Determine the empirical and molecular formula of A, if its vapour density is 45. ​

Answer 1

Explanation:

element %. relative no. simplest ratio

H. 2.2. 2.2/1=2.2. 2.2/2.2=1

O. 71.1. 71.1/16=4.4. 4.4/2.2=2

C. 26.7. 26.7/12=2.2. 2.2/2.2=1

empirical formula of compound is CHO2

empirical mass of component=atomic mass of C+atomic mass of H+2x atomic mass of O

=12+1+2×16=45

molecular mass=2×vapour density=2×45=90

n=molecular mass/empirical mass=90/45=2

the molecular formula of compound is C2H2O4

Answer 2

Answer:

the above answer is correct