Dalton's Law of Partial Pressure Demo

A Bourdon pressure gauge and a syringe with a valve is affixed to a 2 hole stopper on a 1L Erlenmeyer flask. The air in the syringe and the air in the flask are at atmospheric pressure. The flask contains a volume of 1.25 L and the syringe has been set to 125 ml. The volume of the gas pushed into the flask represents 1/10 of the volume thus 10 percent of molecules are added to the flask which should increase the total pressure to about 76 torr which is 10 percent of 760 torr (standard pressure). This all

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