Answer
370 torr
Work Step by Step
Using Dalton's law, we have
$P_{total}=P_{N_{2}O}+ P_{O_{2}}$
$\implies P_{N_{2}O}= P_{total}-P_{O_{2}}$
$=740\, mmHg-370\,mmHg$
$=370\,mmHg=370\,torr$
(as 1 mmHg$\approx$1 torr)
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