when a certain quantity of salt as solute was added to 100g of pure water at 25 degree celsius, the vapor reduced to one half of that of the pure solvent. If the vapor pressure of the water is 23.76mmHg, what is the amount in mole of the salt added?

Ibelieve y y even though i've only taken chemistry for one year

It's called the falling actionwrong subject by the way

Vander waals forces are inter molecular bonds that exist within molecules of the same substance. a water molecule is made up of oxygen and hydrogen atoms which share electrons between each other. the vander waals forces are forces that exist between multitude of different  molecules of water. dipole dipole forces is the type of vander waals force that exist in water. the oxygen atom which is more electronegative pulls the shared electron closer to itself thus generating a partial negative charge while the hydrogen acquire a partial positive charge. these two different charges causes attraction to occur in water molecules.