This report contains experimental P-V-T values for four gravimetrically prepared CO, + CH4 mixtures.
For each mixture, a Burnett apparatus was used to measure densities at 300 and 320 K at pressures to 10
MPa. A continuously weighed, high pressure pycnometer was used to measure densities at temperatures
from 225 to 350 K (at 25 K increments) and pressures to 35 MPa. The densities are accurate to better
than 0.1 %, and a detailed error analysis is given. Second, third and cross viria1 coefficients, energies
and entropies were derived from P-V-T measurements. The derived enthalpies are of approximately the
same accuracy (within a factor of two) as those obtained from calorimetric measurements. This report
contains approximately 400 measured values and approximately 800 derived values.