In an open-ended manometer, the left mercury level (Gas flask side) is 50 mm higher than the right mercury level (Open-end side). What is the gas pressure (in atm) when the air pressure is 750 mmHg. (1 atm = 760 mmHg)
(a) 0.987 atm
(b) 0.921 atm
(c) 1.05 atm
(d) None of the above
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