Dalton.Lyon

Daltons Law of Partial is very simply addition or subtraction, depending on what you want to find. The equation is:

PressureTotal = Pressure1 + Pressure2

[example problem 1] So, on a given day, if the pressure of the nitrogen in the air is 56.8 mm Hg. and everything else was 456 mm Hg, what would the total pressure of the day be?

You are solving for PressureTotal.

PressureTotal = 56.8 + 456

514.6= 56.8+ 456


 * PressureTotal = 514.6**

[example problem 2] If the total pressure of the day is 761 mm Hg, and the pressure of the hydrogen gas in the air is 26.3 mm Hg, what is the pressure of everything else?

You are solving for Pressure2.

761 = 26.3 + Pressure2.

First, you need to isolate Pressure 2, to do this, subtract 26.3 from each side.

761- 26.3 = Pressure2

To get your answer, simplify.


 * 734.7=Pressure2**

The same process would apply if you were looking for Pressure2.



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