Question

The empirical formula of compound is CH2O its molecular weight is 90.calculate the molecular formula of the compound

Answer 1

Hello Mate:

Here is ur answer;

Empirical formula

C=12

H=1

O=16

CH2O=12+1(2)+16 =30grm

Molecular weight=90grm

Molecular formula =90/30=3

(CH2O)3=C3H6O3

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Answer 2

Answer: The molecular formula for this compound is $C_3H_6O_3$

Explanation:

To calculate the molecular formula, we need to find the valency which is multiplied by each element to get the molecular formula.

The equation used to calculate the valency is:

$n=\frac{\text{Molar mass of molecular formula}}{\text{Molar mass of empirical formula}}$

We are given:

Molar mass of molecular formula = 90g/mol

Molar mass of empirical formula $CH_2O=[12+(2\times 1)+16]=30g/mol$

Putting values in above equation, we get:

$n=\frac{90g/mol}{30g/mol}=3$

Multiplying each element of the empirical formula by 3, we get:

Molecular formula = $C_3H_6O_3$