Question

A molecule contains five atoms and has a molecular weight of 85 g per mole. the atoms are of elements with atomic numbers 1, 6, and 17. which molecular structure could represent this molecule?

Answer 1

Dichloromethane

Step-by-step explanation:

As we know the atomic number given belongs to following elements, i.e.

Atomic # Element M.Mass

1 Hydrogen 1 g.mol⁻¹

6 Carbon 12 g.mol⁻¹

17 Chlorine 35.5 g.mol⁻¹

Also the molecular formula of Dichloromethane is,

= CH₂Cl₂

Putting molar masses of each element,

= (12)₁ + (1)₂ + (35.5)₂

= 12 + 2 + 71

= 85 g.mol⁺¹

Result:

Hence the only possible structure containing 5 atoms is Dichloromethane.