Problem: Estimate the external pressure at which diethyl ether will boil at 40 oC.

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A graph of vapor pressure in torr versus temperature in degrees Celsius shows curves for diethyl ether (normal boiling point 34.6 Celsius at 760 torr), ethanol (normal boiling point 78.3 Celsius at 760 torr), water (normal boiling point 100 Celsius at 760 torr), and ethylene glycol (no normal boiling point listed). The curve for diethyl ether has points (0, 200), (17, 400), (20, 450), (28, 600), (35, 800), (40, 1000). The curve for ethanol has points (0, 10), (20, 15), (40, 160), (48, 200), (60, 340), (64, 400), (72, 600), (80, 800), (82, 1000).

Estimate the external pressure at which diethyl ether will boil at 40 oC.

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