- Can a molecule exist without a London dispersion force?

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Compute the molarity of 0.222 solution of h2so4 to react with a strong base? Chemistry help plz.? How do I determine the number of pi electrons? Is it 2 for each pi bond and then count any unpaired electrons? Doing Chem and this is the problem :
Calculate the formula mass of calcium chlorite, Ca(ClO2)2, in atomic mass units (amu or u).? How much heat is involved in the condensation of 5.00 L of water? The density of water at 100°C is 0.958 g/mL and ∆H°vap of water is 40.7?