The concentration of solutions can be expressed in number of ways such that Normality, Molarity, Molality, Mole fractions, Strength, `%` by weight, `%` by volume and `%` by strength. The molarity of ionic compound is usually expressed as formality beacuse we use formula weight of ionic compound. Addition of water to a solution changes all these terms, however increase in temperature does not change molality, mole fraction and `%` by weight terms.
Which is not a molecular formula?
A. `C_(6)H_(12)O_(6)`
B. `CH_(3)COOH`
C. `NO_(2)`
D. `Th(NO_(3))_(4)`