Question

A substance has an empirical formula of CH2 and a molar mass of 56 grams per mole. What is the molecular formula for this compound?

Answer 1

moler mass of CH2 is 14 so 14×4=56

so moleculer formula of CH2 is C4H8

Answer 2

The molecular formula for this compound is $C_4H_8$

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.

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:

$n=\frac{\text{molecular mass}}{\text{empirical mass}}=\frac{56}{14}=4$

The molecular formula for this compound is $4\times CH_2=C_4H_8$

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