A sample of 2.50% aqueous solution of ammonium nitrite (NH₄NO₂) was placed in a 1.00 L cylindrical container with a movable piston then NH₄NO₂ was allowed to decompose to N₂(g) and H₂O(l). The decomposition reaction is a first-order reaction and has a half-life of 2.54 h. The gas produced during the reaction pushes the piston against a constant external pressure of 746 mmHg. After 1.50 h has passed, what is the PV work done (in J)? Assume that the solution's density is 1.00 g/mL and the temperature is kept constant at 25.0°C.