where H ZIF,gas is the Henry coefficient [g gas/(g ZIF•bar)] of gas adsorbed in ZIF. Henry's law states that the adsorbed mass constituted by each species scales linearly with the partial pressure of that species in the gas phase, and is only a good approximation at dilute conditions (i.e., for small |p|). Identifying the Henry coefficients. The Henry coefficient is the initial slope of the purecomponent adsorption isotherm. We determined the slope by a linear regression routine, with the intercept constrained at zero, fitting only to the two lowest-pressure data points in each adsorption isotherm.