Бр
3 Br
2 (0
+
8 NH
'3 (9)
6 NH Br
+ N

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

let that person have a turn to speak : )

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.