162) A 2 litre flask containing NH₃ at atm is connected to a 3 litre flask containing HCl at 3 atm through a narrow tube. What is the final total pressure if T is constant?

163) LiNO₃ decomposes on heating producing gases and a solid residue. Of 4 mol of LiNO₃ are decomposed, then volume of gas evolved at STP is:

164) 0.553 gm of a Boron−Hydrogen compound created a pressure of 0.658 atm in a bulb of 407 mL at 373 K. If the compound has 85.7% boron, what will be the molecular formula of the compound?

165) 4 gm of argon in a bulb at a temperature of T K, had a pressure P atm. When the bulb was placed in hotter bath at a temperature 50^o more than the first one, 0.8 gm of gas had to be removed to get the original pressure. T is equal to:

166) The vapour pressure of water at 20^oC is 17.5 torr. What will be the number of moles of water present in 1 L of air at 20^oC and 40% relative humidity?