Glicerol
[tex]C_3H_8O_3[/tex]
[tex]3 \times 12u + 8 \times 1u + 3 \times 16u = 36u + 8u + 48u = \boxed{ 92u}[/tex]
Etanol
[tex]C_2H_5OH[/tex]
[tex]2 \times 12u + 6\times 1u + 16u = 24u + 6u + 16u = \boxed{46u}[/tex]
Metanol
[tex]CH_3OH[/tex]
[tex]12u + 4 \times 1u + 16u = 12u + 4u + 16u = \boxed{32u}[/tex]