A. 24,6%.
B. 30,4%.
C. 28,3%.
D. 18,8%.
C
\(\begin{array}{l} + \,\,\left\{ \begin{array}{l} {C_n}{H_{2n + 1}}N\,\,(x\,\,mol) \to C{H_2} + NH\\ {C_m}{H_{2m + 2}}\,\,(y\,\,mol) \to C{H_2} + {H_2} \end{array} \right\} \Rightarrow X \to \left\{ \begin{array}{l} NH:\,\,x\,\,mol\\ {H_2}:\,\,y\,\,mol\\ C{H_2}:\,\,z\,\,mol \end{array} \right\}\\ \Rightarrow \left\{ \begin{array}{l} {n_X} = x + y = 0,14\\ {n_{C{O_2}}} = z = 0,36\\ {n_{{H_2}O}} = 0,5x + y + z = 0,46 \end{array} \right. \Rightarrow \left\{ \begin{array}{l} x = 0,08\\ y = 0,06\\ z = 0,36 \end{array} \right. \Rightarrow \left\{ \begin{array}{l} {n_{a\min }} = 0,08\\ {n_{ankan}} = 0,06 \end{array} \right.\\ Ta\,co:\,0,08.a + 0,06.b = 0,36 \Rightarrow a = 3,b = 2\\ \Rightarrow X\,\,gom\,\,\left\{ \begin{array}{l} {C_3}{H_7}N:\,\,0,08\,\,mol\\ {C_2}{H_6}:\,\,0,06\,\,mol \end{array} \right\} \Rightarrow \% {C_2}{H_6} = \frac{{0,06.30}}{{0,08.15 + 0,06.2 + 0,36.14}} = 28,3\% . \end{array}\)
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