How many moles of O2 react with 0.800 mol of Cu2O in the following reaction?
2 Cu2O(s) + O2(g) → 4 CuO(s)
1.200 mol
0.400 mol
0.800 mol
1.600 mol

Answer two atoms of oxygen;

If this is a true or galse then its true but if not then what is the question?

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.