Your math seems right at first glance. But keep in mind that it will only expel 25kg of working gas in those 14 hours. For a short trip to mars with a heavy roc

Your math seems right at first glance. But keep in mind that it will only expel 25kg of working gas in those 14 hours. For a short trip to mars with a heavy rocket this kind of drive might not matter, but imagine a probe that can run this engine for a decade.