Calculated values of equilibrium composition,thermodynamic and transport properties of a mixture of 50% carbon and 50% hydrogen are presented in this paper.The calculations are performed under atmospheric pressure and in the temperature range of 300 K-30000 K,which assume local thermodynamic equilibrium.Thermodynamic properties are calculated by theoretical analysis of statistical thermodynamics.Calculations of transport properties,including viscosity,thermal conductivity and electrical conductivity,are carried out using the Chapman-Enskog method up to higher approximations.A complete database of transport cross sections for relevant interactions has been derived from interactive potentials[1]or calculated using analytical forms reported in previously published studies.