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ICSE Class 10 Chemistry Question 21 of 23

Solved Sample Paper 1 — Question 21

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21
Question

Question 8(ii)

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

Answer

Given,

empirical formula = CH2O

Hence, empirical formula mass = 12 + 2(1) + 16 = 12 + 2 + 16 = 30 g

molecular formula = n x empirical formula

where,

n = molecular massempirical formula mass\dfrac{\text{molecular mass}}{\text{empirical formula mass}}

∴ n = 18030\dfrac{180}{30} = 6

Hence, molecular formula = 6 x CH2O = C6H12O6

Therefore, the molecular formula of the compound is C6H12O6