Chlorine is widely used to purify municipal water supplies and to treat swimming pool waters. Suppose that the volume of a particular sample of gas...

Chlorine is widely used to purify municipal water supplies and to treat swimming pool waters. Suppose that the volume of a particular sample of gas is 8.70 l at 895 torr and 25 Celsius. How many grams of Cl2 are in the sample? what volume will the Cl2 occupy as STP?