At 762.0 torr a mouse is placed in a sealed chamber with air. This chamber is equipped with the enough solid KOH to absorb any H2O and CO2 formed by the mouse. The gas volume in this chamber is calculated to be exactly 2.80 L, and the temperature is held constant at the 291K.
What mass of oxygen has the mouse consumed if after two hours the pressure inside the chamber falls to 726.2torr.