CnH2n+2 - A
n/(2n+2) = 3/8 =>6n + 6 = 8n
2n = 6
n = 3
C3H8 - A = propan
A + Cl2 = CH3-CH2-CH2-Cl + HCl
A + Cl2 = CH3-CH(Cl)-CH3 + HCl
A => CH3-CH=CH2 + H2
A => CH4 + CH2=CH2
CH4 + 2 O2 = CO2 + 2 H2O
V c.n. = 22,4 l
1 mol metan.....2*22,4 l O2
3 moli metan............x
x = 134,4 l O2
V O2 = 20/100*V aer
V aer = 134,4*5 = 672 l aer