Answer to Question #139739 in General Chemistry for Javier

Question

During the weather report on TV, the pressure was given as 28.9 inches of mercury. What is this pressure in mm Hg?

Answer 1

Q139739

During the weather report on TV, the pressure was given as 28.9 inches of mercury. What is this pressure in mm Hg?

Solution :

The pressure given to us is = 28.9 inches of Hg.

and we are asked to convert it to 'mm Hg '

We have to use a proper conversion factor for converting 'inch of Hg' to 'mm of Hg'

We know 1 inch = 25.4 cm

So, 1 inch of Hg = 25.4 mm of Hg

Pressure in 'mm Hg' = 28.9 inch of Hg * 25.4 mm Hg/ 1 inch of Hg

= 734.06 mm Hg.

In question, we are given 28.9 inches of mercury in 3 significant figures, so our final answer must also be in 3 significant figures.

734.06 mm Hg in 3 significant figures is equal to 734 mm Hg. 

So the pressure in ''mm Hg' = 734 mm Hg.

Please also refer to the image I have sent to you.

Thank you. :)