Simultaneous measurements of temperature, size, and velocity for individual spherical carbon particles (100 μm < d p < 160 μm) burning in an entrained-flow reactor were used to calculate overall combustion rates and rate parameters at conditions typical of pulverized-fuel combustors (i.e., particle temperatures from 1400K to 2200K). In addition, particles were collected and the carbon mass loss determined at three residence times in the reactor for seven different sets of bulk O 2 mole fractions (from 0.12 to 0.36) and gas temperatures (from 1300K to 1775K). The measured carbon mass loss was compared to calculations of the particle mass profile based on the overall combustion rate parameters obtained from the experimental particle temperatures. The measured and calculated mass profiles agree only when the formation of CO 2 in the vicinity of the particle is accounted for in the particle energy balance. A simple model is used to account for CO 2 formation that results in overall rate parameters that agree well with the measured particle temperatures and carbon mass-loss profiles. The sphericity of the porous carbon used as the model char allows the calculation of the particle mass loss from measurements of the particle size and density, thereby verifying closure of the mass balances. The data set obtained from this work provides the necessary input for future experimental validation of theoretical models that describe processes occurring in the boundary layer of burning carbon particles.