# Question #c96db

##### 1 Answer

**!! LONG ANSWER !!**

Let's start by determining the gas' molecular formula. This is done by determining the mole ratio that exists between carbon and chlorine in the compound.

Start by dividing the percentage each element has by its molar mass

DIvide each of these numbers by the smallest one to get the mole ratio between carbon and chlorine

The empirical formula will be

To determine the value of

DIvide the mass of the sample by the number of moles to get the molar mass

The molecular formula is **dichloroethyne** (or **dichloro acetylene**).

Now for the Lewis structure. The total number of valence electrons will be **22** **4** from each carbon atom and **7** from each chlorine atom. The Lewis structure will look like this

All the atoms have a full octet, and all the **22** valence electrons are accounted for.

According to VSEPR Theory, the molecular geometry will be **linear**, each carbon atom having both the **steric number**, and the **coordination number** equal to **2**. i.e each carbon atom is only bonded to two other atoms and has no lone pairs. Bond angles will be