The pressure is given in mmHg, so we convert it to atmospheres by dividing by 760 (since 1 atm = 760 mmHg). The volume is given in mL, so we convert it to liters by dividing by 1000 (since 1 L = 1000 mL).
\[ P = \frac{753 \, \text{mmHg}}{760 \, \text{mmHg/atm}}
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