A tank contains 11.0 g of chlorine gas (Cl2) at a temperature of 82°C and an absolute pressure of 5.60 × 105 Pa. The mass per mole of Cl2 is 70.9 g/mol. 

(a) Determine the volume of the tank. 

(b) Later, the temperature of the tank has dropped to 31°C and, due to a leak, the pressure has dropped to 3.80 × 105 Pa. How many grams of chlorine gas have leaked out of the tank?