what is the structure of CH3NH2 and CH3NH3
Here is methylamine.
http://en.wikipedia.org/wiki/Methylamine
For the CH3NH3^+, just add a H^+ (complete with charge) to the terminal N.
The structure of CH3NH2 (methylamine) and CH3NH3+ (methylammonium) can be determined by understanding the bonding and arrangement of atoms.
CH3NH2 has a molecular formula of CH3NH2. It consists of a methyl group (CH3) attached to an amino group (NH2) via a single covalent bond. The central nitrogen atom forms three sigma (σ) bonds, one with the carbon atom in the methyl group and two with the hydrogen atoms. The nitrogen atom also has a lone pair of electrons, which gives the molecule a slight dipole moment.
On the other hand, CH3NH3+ (methylammonium) is the conjugate acid of methylamine. It is formed when methylamine accepts a proton (H+) and becomes positively charged. The structure of CH3NH3+ is similar to CH3NH2, but with an additional hydrogen atom attached to the nitrogen atom. So, CH3NH3+ has the formula CH3NH3+ and is tetrahedral in shape. The central carbon atom forms three sigma (σ) bonds with two hydrogen atoms and one nitrogen atom, while the nitrogen atom forms a sigma (σ) bond with the carbon atom and also carries a positive charge.
To visualize these structures, you can use molecular modeling software, such as ChemDraw or Avogadro, or consult chemical databases and literature that provide structural information.