The empirical formula and molecular mass of a compound are CH2O and 180 g respectively. What will be the molecular formula of the compound?

Question

The empirical formula and molecular mass of a compound are CH2O and 180 g respectively. What will be the molecular formula of the compound? (A) C9H18O9 (B) CH2O (C) C6H12O6 (D) C2H2O2

Tardigrade Admin · Accepted Answer

Empirical formula mass = CH 2 O =12+2 × 1+16=30 Molecular mass =180 n=( text Molecular mass / text Empirical formula mass ) =(180/30)=6 ∴ Molecular formula = n × empirical formula =6 × CH 2 O = C 6 H 12 O 6

Q. The empirical formula and molecular mass of a compound are $C H_{2} O$ and $180 g$ respectively. What will be the molecular formula of the compound?

$C_{9} H_{18} O_{9}$

$C H_{2} O$

$C_{6} H_{12} O_{6}$

$C_{2} H_{2} O_{2}$

Empirical formula mass $= C H_{2} O$
$= 12 + 2 \times 1 + 16 = 30$
Molecular mass $= 180$
$n = \frac{Molecular mass}{Empirical formula mass}$
$= \frac{180}{30} = 6$
$∴$ Molecular formula $= n \times$ empirical formula
$= 6 \times C H_{2} O$
$= C_{6} H_{12} O_{6}$

Q. The empirical formula and molecular mass of a compound are CH2​O and 180g respectively. What will be the molecular formula of the compound?

C9​H18​O9​

CH2​O

C6​H12​O6​

C2​H2​O2​