Asample of freon-12 (cf2cl2) occupies 25.5 l at 298 k and 153.3 kpa. find its volume at stp.

35.8 L  
According to the combined gas law: pV=nRT 
p=pressure
 V=volume
 T=temperature in Kelvin
 R=the universal gas constant
  n=number of moles of the gas
 
 Rearranging the equation: n= pV/RT
 n=(153.3kPa)(25.5L)/R(298K)= 13.1/R 
 At STP (standard temperature and pressure) p=100kPa and T=273.15K. 

 Rearranging the equation again: V=nRT/p V=[(13.1/R)(R)(273.15K)]/100kPa = 35.8L

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.

True is ur answer : )