Respuesta :

atski
STP (standard temperature & pressure) is 1 atm and 273.15 K. 
We use PV= nRT

(1 atm) V = 2.25 mol (0.082057 L atm mol^-1 K^-1) (273.15 K) 
Solve for V
V= 50.4312064875 L 

There are 3 sig figs. 

V= 50.4 L