J.R. S. answered 11/19/22
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691 torr
140 mm Hg (?) = 140 torr
691 torr - 140 torr = 551 torr
551 torr x 1 atm / 760 torr = 0.725 atm
551 torr x 1 atm / 760 atm x 101325 Pa / atm = 73,500 Pa