100 mL of water vapor is decomposed at high temperature to produce hydrogen and oxygen. The volumes of hydrogen and oxygen formed, when measured at 25 degrees Celsius and atmospheric pressure, are respectively __​

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.

yes the answer is total mass in unchanged   : )