Question

The empirical formula of a compound is CH20. It's molecular weight is 90.Calculate the molecular formula of compound?​

Answer 1

Answer:-

C₃H₆O₃

Explanation :-

Given:-

→ Empirical formula = CH₂O

→ Molecular mass = 90

To find:-

→ Molecular formula of the compound

Solution:-

• Atomic mass of Carbon (C) = 12u

• Atomic mass of Hydrogen (H) = 1u

• Atomic mass of Oxygen (O) = 16u

Empirical formula mass :-

= 12+1×2+16

= 12+2+16

= 30

Now, we know that :-

n = Molecular mass/Emp. formula mass

=> n = 90/30

=> n = 3

Molecular formula = Emp.formula × n

= CH₂O × 3

= C₃H₆O₃

Thus, molecular formula of the compound is C₃H₆O₃ .