Consider the rate below r=k(l)^2(xy) what is the overall order of the reactants in this reaction? 0 1 2 3

The Order of Reaction is defined as, "the sum of the exponents of the concentration terms in the rate expression of the reaction".
The rate expression given is,

                                    Rate  =  k [L]² [XY]
So,
The sum of exponents is,
                                         2 + 1 = 3

It is a third order reaction, provided it is second order with respect to concentration of L and first order with respect to concentration of XY.

Result:
          It is 3rd Order Reaction.

Molarity is moles of solute over liters of solution. idk if that is what you are talking about, but you can convert moles of solute to grams of solute using dimensional analyzes by using molar mass found on the periodic table.