Flask filled with ammonia gas under standard conditions, inverted in water, filling the flask with water, if the ammonia gas is dissolved in the flask, the concentration of the substance of the resulting ammonia water Flask filled with ammonia under standard conditions, inverted in water, filling the flask with water, if the ammonia is dissolved in the flask, the concentration of the substance of the resulting ammonia water

Flask filled with ammonia gas under standard conditions, inverted in water, filling the flask with water, if the ammonia gas is dissolved in the flask, the concentration of the substance of the resulting ammonia water Flask filled with ammonia under standard conditions, inverted in water, filling the flask with water, if the ammonia is dissolved in the flask, the concentration of the substance of the resulting ammonia water

C (NH3·H2O)==n/V==n/(n*Vm)==1/Vm
Equal to 1/22.4=0.045 mol/L due to standard conditions

Why is it that wet flasks lead to the failure of fountain experiments with ammonia and water Isn't the pressure in the flask reduced, and the pressure difference should make a fountain

Not so. When NH3 is absorbed by water, the air pressure in the flask decreases, so the air enters the flask, making the internal and external pressures equal, so the fountain experiment fails.