Question

Consider the image of a mercury manometer below. Based on the image, if the pressure of the atmosphere is 760.0 mmHg, the pressure of the gas is Open end Gas 13.7 cm mmHg

Answer 1

h Patmosphe + Paps 1 Pamosphens 760 h 13.7 Cm 13.7 x 10 Mm : 137 mm 60 mm + 137 mm (760+ 137) mm 897 mm 1

Answer 2

As the mercury on the side of the gas container is higher than the mercury on the open-ended side, the pressure of the gas is LOWER than the pressure of the atmosphere (atmosphere is pushing the mercury down more than the gas is).

So: 

Pgas = Patm - h mmHg

where = Patm is 760 mmHg and h is the difference in height (13.7 cm => 137 mm)

Pgas = 760 mmHg - 137 mmHg

Pgas = 623 mmHg