# When a container is filled with 3.00 moles of #H_2#, 2.00 moles of #O_2#, and 1.00 mole of #N_2#, the pressure in thecontainer is 768 kPa. What is the partial pressure of #O_2#?

##### 1 Answer

**Partial Pressure of** **= 256 kPa.**

Dalton's law of partial pressures covers two concepts;

*Mole fraction**Partial pressure*

Let's talk about Mole Fraction first.

You have a mixture of

Next, the equation of the partial pressure of a gas can be written as;

Since now we know the mole fraction of

Note:

The total pressure can be calculated using this;