A mouse is placed in a sealed chamber with air at 762.0torr. This chamber is equipped with sufficient solid KOH to absorb any CO2 and H2O produced by the mouse. The gas volume in this chamber is computed to be exactly 2.30 L and the temperature is held constant at 292K. subsequent to two hours the pressure inside the chamber falls to 725.2torr. Explain what mass of oxygen has the mouse consumed?