modeling the response of the sensing elements to each gas composition. We invoke Henry's law of gas adsorption to predict the equilibrium, gravimetric response of-i.e., the mass of gas adsorbed in-each ZIF sensing element in response to any concentration of CO 2 , C 2 H 4 , and H 2 O in the gas phase. We identify the Henry coefficients from experimental adsorption measurements. Importantly, we model noise in the observed response to account for imperfect devices/transducers such as a quartz crystal microbalances that relay to us, via an electrical signal, the mass of gas adsorbed in the ZIF sensing elements.