Bài 3:
a) PTHH: CnH2n-2 + 2Br2 --> CnH2n-2Br4
b) nBr2 = 0,15.1 = 0,15 (mol)
=> \(n_{C_nH_{2n-2}}=\dfrac{0,15}{2}=0,075\left(mol\right)\)
=> \(M_{C_nH_{2n-2}}=\dfrac{1,95}{0,075}=26\left(g/mol\right)\)
=> n = 2
CTPT: C2H2 (axetilen)
CTCT: \(CH\equiv CH\)
c) hh khí gồm \(\left\{{}\begin{matrix}C_2H_2:0,075\left(mol\right)\\C_2H_6:0,075\left(mol\right)\end{matrix}\right.\)
Bảo toàn C: \(n_{CO_2}=0,075.2+0,075.2=0,3\left(mol\right)\)
=> mCO2 = 0,3.44 = 13,2 (g)