Ncert Exercises & Solutions

The empirical formula and molecular mass of a compound are ${CH}_{2} O$ and 180 g, respectively. The molecular formula of the compound is:
1. C₉H₁₈O₉
2. CH₂O
3. C₆H₁₂O₆
4. C₂H₄O₂

Hint:

n = Molecular

mass Empirical

formula

mass

Empirical formula mass

= {CH}_{2} O

Formula

mass

is

= 12 + 2 \times 1 + 16 = 30

Molecular

mass = 180

n = Molecular

mass Empirical

formula

mass

= \frac{180}{30} = 6

∴ Molecular

formula = n \times empirical

formula

= 6 \times {CH}_{2} O

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

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