To determine the number of valence electrons in a CH3CH2CONH2 molecule, we need to consider the valence electrons contributed by each atom.
In the molecule CH3CH2CONH2, let's count the valence electrons for each atom:
Carbon (C): Carbon is in group 14 of the periodic table, so it has 4 valence electrons.
Hydrogen (H): Hydrogen is in group 1 of the periodic table, so it has 1 valence electron.
Oxygen (O): Oxygen is in group 16 of the periodic table, so it has 6 valence electrons.
Nitrogen (N): Nitrogen is in group 15 of the periodic table, so it has 5 valence electrons.
Now let's count the number of atoms in the molecule:
C: 2 (one in CH3 and one in CH2)
H: 6 (three in CH3 and three in CH2)
O: 1
N: 1
Adding up the valence electrons:
2C × 4 valence electrons = 8 valence electrons
6H × 1 valence electron = 6 valence electrons
1O × 6 valence electrons = 6 valence electrons
1N × 5 valence electrons = 5 valence electrons
Total valence electrons: 8 + 6 + 6 + 5 = 25 valence electrons
Therefore, the CH3CH2CONH2 molecule has a total of 25 valence electrons.