For a reaction,$N_2O_{5(g)} \rightarrow 2NO_{2(g)} + \frac{1}{2}O_{2(g)}$ in a constant volume container,no products were present initially. The final pressure of the system when $50\%$ of the reaction is completed is:
- A$7/2$ times of initial pressure
- B$5$ times of initial pressure
- C$5/2$ times of initial pressure
- D$7/4$ times of initial pressure
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