a) etanol C₂H₅OH

$M_{C_2{H}_{5}OH}=46\text{u}$  

$\%C=\frac{m_C}{m_{C_2{H}_{5}OH}}\cdot 100\%=\frac{2\cdot 12\text{u}}{46\text{u}}\cdot 100\%=52,2\%$  

 

b) etano-1,2-diol C₂H₆O₂

$M_{C_2{H}_6{O}_2}=62\text{u}$  

$\%C=\frac{m_C}{m_{C_2{H}_6{O}_2}}\cdot 100\%=\frac{2\cdot 12\text{u}}{62\text{u}}\cdot 100\%=38,7\%$ $\%C=\frac{m_C}{m_{C_2{H}_6{O}_2}}\cdot 100\%=\frac{2\cdot 12\text{u}}{62\text{u}}\cdot 100\%=38,7\%$  

 

c) pentanol C₅H₁₁OH

$M_{C_5{H}_{11}OH}=88\text{u}$  

$\%C=\frac{m_C}{m_{C_5{H}_{11}OH}}\cdot 100\%=\frac{5\cdot 12\text{u}}{88\text{u}}\cdot 100\%=68,2\%$  

 

d) glicerol C₃H₈O₃

$M_{C_3{H}_8{O}_3}=92\text{u}$  

$\%C=\frac{m_C}{m_{C_3{H}_8{O}_3}}\cdot 100\%=\frac{3\cdot 12\text{u}}{92\text{u}}\cdot 100\%=39,1\%$  

 

e) heksanol, C₆H₁₃OH

$M_{C_6{H}_{13}OH}=102\text{u}$  

$\%C=\frac{m_C}{m_{C_6{H}_{13}OH}}\cdot 100\%=\frac{6\cdot 12\text{u}}{102\text{u}}\cdot 100\%=70,6\%$  

 

f) butan-1-ol C₄H₉OH

$M_{C_4{H}_{9}OH}=74\text{u}$  

$\%C=\frac{m_C}{m_{C_4{H}_{9}OH}}\cdot 100\%=\frac{4\cdot 12\text{u}}{74\text{u}}\cdot 100\%=64,9\%$  

 

g) C₇H₁₆O₂

$M_{C_7{H}_{16}{O}_2}=132\text{u}$  

$\%C=\frac{m_C}{m_{C_7{H}_{16}{O}_2}}\cdot 100\%=\frac{7\cdot 12\text{u}}{132\text{u}}\cdot 100\%=63,6\%$  

 

h) C₅H₁₂O₃

$M_{C_5{H}_{12}{O}_3}=120\text{u}$  

$\%C=\frac{m_C}{m_{C_5{H}_{12}{O}_3}}\cdot 100\%=\frac{5\cdot 12\text{u}}{120\text{u}}\cdot 100\%=50\%$