Cube is filled with ideal gas what will be the new pressure of it

Question

if a cube is filled with an ideal gas to a pressure of 18.0 atm at 0°C(273K) and volume of the cube doubles and the temperature is raised to 25°C, what is the new pressure? 

Answer 1

The combined gas law can be used to solve this

 

P₁ V₁  / T₁  =  P₂ V₂ /  T₂  

 

Plugging in  P₁  =18   ; T₁ = 273  ; V₂ =  2 V₁   ;  T₂ = 298   and cancelling out the factors of V₁

 

The result for P₂ = 9.82 atm