Virtual Instrument Based for Automation Measuring the Decomposition Equilibrium Constant of Matter and Enthalpy Change

Abstract

The automation measuring systems based on virtual instrument was developed, which was applied to measure the decomposition equilibrium constant of matter and enthalpy change. which can acquire real-time automatic experimental data, dynamic display, automatic drawing p~T curve and showing the equation of p~T curve, automatic data processing and generating K^Θ_p and Δ_rH^Θ_m important parameters of physical chemistry. Experiment results show that it developed on LabVIEW 8.0 was simple and effortless in designing program, the interfaces of beautiful and friendly, easy-extending, It was applied to measure the decomposition reaction of ammonium carbamate, the relative error of Δ_rH^Θ_m is -0.30 per cent compare with the references and avoids resulting mistaking by human error from operation by human date recording and date-processing by handwork. The accuracy and recurrence of experimental results are greatly improved.