# After 0.600 L of Ar at 1.29 atm and 223 degrees Celsius is mixed with 0.200 L of O2 at 535 torr and 106 degrees Celsius in a 400.-mL flask at 23 degrees Celsius, what is the pressure in the flask?

##### 1 Answer

Concept of partial pressure is to be applied here.

Let the partial pressure of

Initially before mixing

Pressure

Temperature

Volume

In the **mixture** it acquires

Pressure

Temperature

Volume

So by combined Boyle's and Charles's equation for ideal gas we can write

Again let the partial pressure of

Initially before mixing

Pressure

Temperature

Volume

In the **mixture** it acquires

Pressure

Temperature

Volume

So by combined Boyle's and Charles's equation for ideal gas we can write

So total pressure in the flask