The pressure of the confined gas will be 769-17 = 752 mmHg
<h3>What is Manometer ?</h3>
Manometer is a U shaped instrument which is used to measure the pressure acting on a column of fluid , a difference in the pressure  in the two arms of the manometer causes the liquid to reach different heights.
The difference  in the heights of the Hg columns in Diagram B is17 mm-Hg.
 the atmospheric pressure is 769 mm-Hg,
the pressure of the confined gas in mm-Hg = ?
The pressure of the confined gas will be 769-17 = 752 mmHg
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3 covalent bonds (there are 2 electrons in the first orbital and 5 in the second. You still have room for three more)
        
             
        
        
        
mole is the standardized form of molarity