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Empirical & Molecular Formula

The empirical...

Question

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 ?

(a) $C_{9} H_{18} O_{9}$ (b) $C H_{2} O$ (c) $C_{6} H_{12} O_{6}$ (d) $C_{2} H_{4} O_{2}$

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Solution

(c)

Empirical formula mass = $C H_{2} O$

$= 12 + 2 \times 1 + 16 = 30$

Molecular mass = 180

$n = \frac{M o l e c u l a r m a s s}{E m p i r i c a l f o r m u l a m a s s}$

$= \frac{180}{30} = 6$

$∴$ Molecular formula $= n \times$ empirical formula

$= 6 \times C H_{2} O$

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

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