Answer:
726 torr
Explanation:
Generally, atmospheric pressure can be measured using a manometer which is in form of a U-shaped tube. In addition, 1 mm Hg is equivalent to 1 torr. Therefore, 752 torr is equivalent to 752 mm Hg. Therefore, the total pressure will be equivalent to the atmospheric pressure (mm Hg) + the mercury height.
In this case, the mercury height = -26 mm
Thus:
The helium pressure = 752 - 26 = 726 mm Hg
This is also equivalent to 726 torr
The pressure of helium in the mercury chamber is elucidated with the difference. The pressure of helium gas is 726 torr.
The pressure is elucidated in terms of mm mercury. 1 mm mercury is equivalent to 1 torr.
The height of mercury in the chamber is 26 mm. Thus, the pressure for the mercury is 26 torr.
The helium has an atmospheric pressure of 752 torr, while the mercury pressure is 26 torr. The pressure exhibited by helium is the difference between the atmospheric and mercury pressure.
The helium pressure is given as:
[tex]\rm He\;pressure=Atmospheric\;pressure-Mercury\;pressure\\He\;pressure=752-26\;torr\\He\;pressure=726\;torr[/tex]
The pressure of helium in the flask is 726 torr.
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