On a day when the atmospheric pressure was 754 torr, the manometer reading on a

Question

On a day when the atmospheric pressure was 754 torr, the manometer reading on a gas sample was found to be 82 torr. What is the gas pressure in torr if it is a closed-end manometer? What is the gas pressure in torr if the open-end of the manometer is higher? The pressure on 750mL of a gas is changed at constant temperature from 720 for to 760 torr. What is the new volume? A sample of 750mL of nitrogen gas is heated from 20 degree C to 100 degree C. In order to keep its pressure constant, to what new volume should the gas be allowed to change?

Explanation / Answer

a) close end manometer gas pressure = manometer reading . becuase no external pressure exerted on gas

so

gas pressure = 82 torr

a) open end manometer gas pressure = manometer reading + atmspoheric pressure

but it is mentioned that higher height

open end manometer gas pressure = atmspoheric pressure - manometer reading

= 754 - 82

= 672 torr

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