Partial pressure

1. Jan 29, 2005

parwana

A mixture of 5.40 g of N2 and 10.2 g of Kr exerts a pressure of 0.505 atm.
What is the partial pressure, in atm, of Kr?

2. Jan 29, 2005

Gokul43201

Staff Emeritus
parwana, please show what you've tried, when you need help with a problem.

3. Jan 29, 2005

parwana

I just dont get the problem at all, i mean does this mean volume and temperature are constant and if so do i make up any numbers for the temp and volume and substitute in the equation pv=nrt??

4. Jan 29, 2005

parwana

i got it, i got the mole fraction of Ke and then times thta by total pressure.

5. Jan 29, 2005

Gokul43201

Staff Emeritus
If you meant "Kr", then yes, that's correct. With any such problem, you want to start from the definitions. In this case, the definition of 'partial pressure' is all you need.