A calorimeter has a mass of 100 g and a specific heat capacity of 0.42 J g-1 K -1
. Into it
are put 60 cm3
of 0.25 mol dm-3
hydrochloric acid and 50 cm3
of 0.25 mol dm-3
potassium hydroxide solutions at the same temperature. The temperature of the
calorimeter and content rises by 5.0 K. Specific heat capacity of the solution = 4.2 J g1 K
-1
. Calculate the standard enthalpy of neutralization

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.