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Converting Units of Pressure

Problem: A chemist collects a sample of Carbon dioxide from the decomposition of Lime stone (CaCO3) in a closed-end manometer (i.e, vacuum is the reference pressure), the height of the mercury is 341.6 mm Hg.

C a l c u l a t e t h e C O 2 p r e s s u r e i n t o r r , a t m o s p h e r e s , a n d k i l o p a s c a l s

.

Plan: The pressure is in mmHg, so we use the conversion factors from Table above to find the pressure in the other units.

Solution: converting from mmHg to torr:

1 torr PCO2 (torr) = 341.6 mm Hg x 1 mm Hg converting from torr to atm:

= 341.6 torr

P

CO2( atm) = 341.6 torr x

1 atm 760 torr

= 0.4495 atm

converting from atm to kPa:

P

CO2(kPa) = 0.4495 atm x

1 0 1 . 3 2 5 k P a

1 atm

= 45.54 kPa

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