What makes the molecular shape of CO2 and NH3 different?

Explanation:

CO2 is linear whereas NH3 has a trigonal pyramidal shape. NH3 is sp3 hybridized and the lone pairs on nitrogen repel other groups around nitrogen thus the bond angle becomes less than 109.5 (typically around 106.7).

CO2 is also sp hybridized and both O are equally pulling on both sides rendering the molecule to be non polar and linear with a bond angle of 180.

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