Question

The empirical formula of a compound is CH2O. What is the molecular formula if the molar mass is 240 g/mol?

Molar mass accounted by empirical formula = 30 g/mol.

Answer 1

Molar mass for compound is 240g

Molar mass of empirical is 30g

Divide 240÷ 30= 8 units of empirical

So, the molecular formula is

C8H16O8

Hope its helpful

Answer 2

The molecular formula is $C_8H_{16}O_8$

Explanation:

Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.  

Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.

The empirical weight of $CH_2O$ = 30g/mol

The molecular weight = 240 g/mole

Now we have to calculate the molecular formula.

$n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}=\frac{240}{30}=8$

The molecular formula will be=$8\times CH_2O=C_8H_{16}O_8$

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