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Solution: Ball-and-stick representations of benzene, a colorless liquid often used in organic chemistry reactions, and acetylene, a gas used as a fuel for high-temperature welding, are shown below.Determine the molecular formula of each.

Problem
Ball-and-stick representations of benzene, a colorless liquid often used in organic chemistry reactions, and acetylene, a gas used as a fuel for high-temperature welding, are shown below.

Benzene is a hexagon ring with carbon atoms forming each of the vertices. There are double bonds alternating with single bonds in the ring, with the first double bond in the upper right side. Each carbon is single bonded out of the ring to a hydrogen. Acetylene is two carbons triple bonded together. Each carbon is also single bonded to one hydrogen.

Determine the molecular formula of each.

Solution

We have to determine the molecular formula of benzene and acetylene using the given ball and stick molecular models.


In a ball and stick model the balls represent the atoms while the sticks represent covalent bonds between atoms.

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