9. A 1.75 L container filled with CO2 gas at 25℃and 225 kPa pressure springs a leak. When the container is re-sealed, the pressure is 200 kPA and the temperature is 10℃. How many moles of gas were lost? (A)0.0101 mol (B)0.149 mol (C)6.71 mol (D)99.0 mol