\(C_4H_{10} \to H_2 + C_4H_8\\ C_4H_{10} \to CH_4 + C_3H_6\\ C_4H_{10} \to C_2H_4 + C_2H_6\\ C_4H_{10} \to C_4H_{10\ dư}\\ n_{C_4H_{10}\ ban\ đầu} = n_{H_2} + n_{CH_4} + n_{C_2H_6} + n_{C_4H_{19}\ dư} = 20(mol)\\ n_{C_4H_{10}\ dư} + 2n_{C_4H_{10}\ pư} = n_A = 35 \to n_{C_4H_{10}\ pư} = 35-20 = 15\\ H = \dfrac{15}{20}.100\% = 75\%\)
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