Question

hon hop khi E gom C2H6,C3H6,C4H6 ti khoi cua E vs hidro la 21 dot hoan toan 2,24 lit khi E (o dktc) thi thu dc m1 gam co2 va m2 gam h2o tinh gia tri cua m1 va m2

Answer 1

Đặt CT chung :\(C_xH_6\)

=> \(M_E=21.2=42\left(\dfrac{gam}{mol}\right)\)

=> 12x+6=42=>12x=36=>x=3

=>CT chung \(C_3H_6\)

\(n_{C_3H_6}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)

\(C_3H_6+\dfrac{9}{2}O_2--to->3CO_2+3H_2O\)

=> \(n_{CO_2}=3n_{C_3H_6}=0,1.3=0,3\left(mol\right)=>m_1=0,3.44=13,2\left(g\right)\)

=> \(n_{H_2O}=3n_{C_3H_6}=0,1.3=0,3\left(mol\right)=>m_2=0,3.18=5,4\left(g\right)\)