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How to draw the propane dot structure (Lewis structure) ?

May 18,2026

Propane is a three-carbon chain alkane with the molecular formula C3H8. With C3H8 there are only single bonds. Whenever you see a compound made of Carbon and Hydrogen that ends in -ane that means it will only have single bonds.

This is the Propane(C3H8) dot structure (Lewis structure):

Propane

Step 1: It have 4 valence electrons for Carbon--it have 3 Carbons. It have 1 valence electron for Hydrogen--8 Hydrogens.

Step 2: Add them up, we get a total of 20 valence electrons for the C3H8 Lewis structure.

Step 3: We'll put the 3 Carbons in a row and the Hydrogens will go around them. The Carbons on the end will have 3 Hydrogens. The Carbons in the center will have 2. So each Carbon is bonded to four different things.

Step 4:Next we'll put a line between atoms to have a chemical bond--that represents 2 valence electrons--until we use all the valence electrons up. So we've used all 20 valence electrons for the C3H8 Lewis structure.

Each Hydrogen has a single bond--that's two valence electrons--so its outer shell is full. And for the Carbons, each Carbon has four single bonds, so that's 8 valence electrons, and that's an octet for the Carbon. So we've satisfied the octets on each of the Carbon atoms.

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Propane

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  • Propane
  • 74-98-6 Propane
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  • CAS:74-98-6
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