Sodium nitrite, NaNO2, is used as a preservative in meat products such as frankfurters and bologna. In an acidic solution, nitrite ion is converted to nitrous acid, HNO2, which reacts with permanganate ion according to the equation:
H++ 5HNO2+ 2MnO4– right-arrow 5NO3 + 2Mn2++ 3H2O

A 1.000 g sample of a water-soluble solid containing NaNO2 was dissolved in dilute H2SO4 and titrated with 0.01000 M KMnO4 solution. The titration required 12.15 mL of the KMnO4 solution. There are 0.0001215 moles of KMnO4.

Using the balanced equation, find the number of moles of HNO2 in the sample.

Answerlimiting reactant;

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.

Ansa leaf changing color in autumn;