Chemistry-
General
Easy

Question

IftheheatofformatioofNO2is‘x[1/2N2(g)+O2(g)→NO2(g)]theheatofreactionN2(g)+O2(g) →2NO(g)isyandtheheatofreaction2NO(g)+O2(g)→2NO2(g) is z then

  1. 2x+z=y    
  2. 2y+z=x    
  3. 2x–z=y    
  4. 2z+x=y    

The correct answer is: 2x–z=y

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