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烃的通式可简化为C_nH_m,m=2n+2时为烷烃;m=2n时为烯烃或环烷烃;m=2n-2时为炔烃或环烯烃或二烯烃;m=2n-6时为苯及苯的同物系。如果设烃的分子量为A,则
The general formula for hydrocarbons can be simplified as C_nH_m, alkanes for m=2n+2; olefins or naphthenes for m=2n; acetylenes or cycloalkenes or diolefins for m=2n-2; m=2n-6 For benzene and benzene homologous system. If the molecular weight of the hydrocarbon is A, then