Question

Calculate the molecular formula of a compound whose empirical formula is CH2O and vapour density is 30.

August 2, 2024

Answer

Empirical formula is CH₂O

Empirical formula weight = 12 + 2(1) + 16

= 12 + 2 + 16

= 30

Vapour density (V.D.) = 30

Molecular weight = 2 × V.D. = 2 × 30 = 60

n = $Molecular\ weight\over Emperical\ Formula\ Weight$

= $60\over 30$

= 2

Molecular formula = (CH₂O)₂ = C₂H₄O₂

Hence, Molecular formula is C₂H₄O₂

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