a)
$C_2H_5OH + Na \to C_2H_5ONa + \dfrac{1}{2}H_2$
$CH_3-CH_2-CH_2-OH + Na \to CH_3-CH_2-CH_2ONa + \dfrac{1}{2}H_2$
b)
n C2H5OH = a(mol) ; n C3H7OH = b(mol)
=> 46a + 60b = 3,32(1)
n H2 = 0,5a + 0,5b = 0,672/22,4 = 0,03(2)
Từ (1)(2) suy ra a = 0,02 ; b = 0,04
%m C2H5OH = 0,02.46/3,32 .100% = 27,71%
%m C3H7OH = 100% -27,71% = 72,29%
\(n_{C_2H_5OH}=a\left(mol\right),n_{C_3H_7OH}=b\left(mol\right)\)
\(\Rightarrow46a+60b=3.32\left(1\right)\)
\(n_{H_2}=\dfrac{0.672}{22.4}=0.03\left(mol\right)\)
\(C_2H_5OH+Na\rightarrow C_2H_5ONa+\dfrac{1}{2}H_2\)
\(C_3H_7OH+Na\rightarrow C_3H_7ONa+\dfrac{1}{2}H_2\)
\(n_{H_2}=0.5a+0.5b=0.03\left(mol\right)\left(2\right)\)
\(\left(1\right),\left(2\right):a=0.02,b=0.04\)
\(\%m_{C_2H_5OH}=\dfrac{0.02\cdot46}{3.32}\cdot100\%=27.71\%\)
\(\%m_{C_3H_7OH}=100-27.71=72.9=29\%\)