(Originais Teachy 2023) - Question Easy of Chemistry

A chemist is analyzing the molecular structure of methane (CH4) and ammonia (NH3). Both molecules are essential in various fields, including agriculture and energy production. Methane, a primary component of natural gas, is used for heating and electricity generation, while ammonia is a key ingredient in fertilizer production. The chemist wants to understand why these two molecules, despite both having a central atom (Carbon in Methane and Nitrogen in Ammonia) surrounded by four other atoms, have different molecular geometries. Based on VSEPR theory and bond hybridization, calculate the bond angles in both methane and ammonia. Use the fact that the bond angle in a perfect tetrahedron is 109.5 degrees.