mC2H2=2*12 u+2*1 u=26 u
mC3H4=3*12 u+4*1 u=40 u
mC4H6=4*12 u+6*1 u=54 u
mC5H8=5*12 u+8*1 u=68 u
mC6H10=6*12 u+10*1 u=82 u