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ICSE Class 10 Chemistry Question 18 of 24

Solved 2023 Question Paper ICSE Class 10 Chemistry — Question 14

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14
Question

Question 6(ii)

The Empirical formula of an organic compound is CHCl2.

If its relative molecular mass is 168, what is its molecular formula?

[At. Wt. C = 12, H = 1, Cl = 35.5]

Answer

Empirical formula is CHCl2

Empirical formula weight = 12 + 1 + 2[35.5] = 12 + 1 + 71 = 84

Molecular weight = 168

n=Molecular weightEmpirical formula weight=16884=2\text{n} = \dfrac{\text{Molecular weight}}{\text{Empirical formula weight}} \\[0.5em] = \dfrac{168}{84} = 2

So, molecular formula = 2(CHCl2) = C2H2Cl4