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## Homework Statement

I had a general inquiry about a relation in my physical chemistry textbook. It stated that when determining the partial pressure of an ideal gas component in a mixture/solution, instead of using the standard Dalton's law: P

_{i}= x

_{i}P

_{tot}, one can simply use the relation P

_{i}= (volume i : volume mixture or solution)P

_{tot}.

I am having a hard time convincing myself of this and have not been able to find a derivation of this in either my book or online. Can someone please help me get started?