Respuesta :

transitionstate
Equation for decomposition is as follow,

                            2 NH₄ClO₃    →    3 O₂  +  2 NH₄Cl

According to eq.

     67.2 L (3 mole) off O₂ is produced by  =  202.98 g (2 moles) NH₄ClO₃
So, 
              200 L of O₂ will be produced by  =  X g of NH₄ClO₃

Solving for X,
                        X  =  (202.98 g × 200 L) ÷ 67.2 L

                        X  =  604.10 g of NH₄ClO₃