反应I2(g)===2I(g)达平: (1)升高温度,平衡常数________________,原因是________________; (2)压缩气体时,I2(g)的________________,原因是________________________________; (3)恒容时充入N2气体,I2(g)的________________,原因是________________; (4)恒压时充入N2气体,I2(g)的________________,原因是________________。