#"We use the ideal gas law,"#
#color(orange)(PV=nRT)#
#"We know the conditions for STP are the following,"#
#P=101.325# #kPa#
#V=?#
#n = 1.0# #mol#
#R=8.314#
#T=273.15# #K#
Plug in your values.
#color(orange)(V_(Ne)=(nRT)/(P)#
#=((1.0mol)(8.314)(273.15))/(101.325)#
#=((1.0mol)(8.314)(273.15))/(101.325)#
#=(2270.9691)/(101.325)#
#V_(Ne)# #=# #22.41# #L#
#"This is true because the volume of an ideal gas is 22.41 L/mol at STP."#