The molar analysis of the gaseous products of the combustion of a type of hydrocarbon fuel is 8 kmol of CO2 , nH2O kmol of H2O, and 47 kmol of N2 . Select a value for nH2O between 5 and 12. The mixture and components behave like ideal gases. Using the given number of moles and your selected value

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The disturbance is only parallel to the motion of the wave.

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.