Chemistry Gases ETEA 2023
PMDC Verified Question 22 of 65
1 atm of pressure is equal to all of the following except:
A
760 cm Hg
B
760 mm Hg
C
760 torr
D
101325 Pa
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: 760 cm Hg
Concept:

Standard atmospheric pressure (1 atm) can be expressed in various units which are frequently tested in conversions.

Solution:

  • The accepted standard conversions for 1 atm are:


  • 1 atm = 760 mm Hg (millimeters of mercury)


  • 1 atm = 760 torr (since 1 torr exactly equals 1 mm Hg)


  • 1 atm = 101325 Pa (Pascals)


  • To convert mm Hg to cm Hg, we divide by 10 (since 1 cm = 10 mm). Therefore, 760 mm Hg = 76 cm Hg.


  • Option A states 760 cm Hg, which is mathematically false (it would equal 7600 mm Hg, or 10 atm).


Why other options are incorrect:

  • Options B, C, & D: These are all completely true and standard equivalencies of 1 atm.

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