A flask containing helium gas is connected to an open-ended mercury manometer. The open end is exposed to the atmosphere, where the prevailing pressure is 752 torr. The mercury level in the open arm is 26 mm above that in the arm connected to the flask of helium. What is the helium pressure, in torr?
A) -26 torr
B) 26 torr
C) 726 torr
D) 778 torr
E) None of these choices is correct.
Correct Answer:
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