During summer if all the doors and windows are kept open and wet curtains are hung, the room remains moderately cool. Explain.

One should not try to cool a kitchen by leaving the refrigerator door open. Explain why.

At room temperature 2NO+O_(2) to 2NO_(2) to N_(2)O_(4) reaction proceeds near to completion. The dimer, N_(2)O_(4) , solidified at 262K. A 250 mL flask and a 100 mL flask are separated by a stop-cock. At 300K, nitric oxide in the longer flask exerts a presure of 1.053 atm and and the smaller one contains oxygen at 0789 atm. the gases are mixed by opening the stopcock and after the end off the reaction the flasks are cooled to 220K. Neglecting vapour pressure of the dimer, find out pressure and composition of the gas remaining at 220 K (assume that the gases behave ideally).