Chemistry: Gas Laws - Pressure in Bottle of Air & Liquid Helium

[Aggie]

Liquid helium at 4.2 K has a density of 0.147 g/mL. Suppose that a 1.00-L metal bottle that contains air at 118K and 1.0 atm pressure is sealed off. If we inject 120.0 mL of liquid helium and allow the entire system to warm to room temperature (25 °C), what is the pressure inside the bottle?

 

[dmoravec]

you need to show some work for us to help you. What have you tried doing/what equations do you have?

 

[Harmony]

To approach this question you need to know the following:
The volume of the container. Convert l into m^3.
The number of moles of He. Consider the density and the volume of the liquid helium.