# How to move forward in balancing this equation?

I want to get the molecular formula for this reaction:

$$\ce{{trans-stilbene} + {m-chloroperoxybenzoic acid} -> {trans-1,2-diphenyloxirane}}$$

and if you do you get this:

$$\ce{C14H12 + C7H5ClO3 -> C14H12O}$$

but what do I do about the chlorine not being present in the products, is it released as $\ce{Cl2}$?

$$\ce{C14H12 ->[C7H15ClO3] C14H12O}\tag{1}$$
$$\ce{C14H12 + C7H15ClO3 -> C14H12O + C7H15ClO2}\tag{2}$$
• @O.kth The typical steps are: 1) Calculate the amount of substance of each reactant 2) determine the limiting reagent 3) using that and the equation to determine the expected amount of product 4) calculating the expected mass of product. Using your numbers, the theoretical yield should be $\pu{1.96g}$. – Jan Mar 1 '17 at 21:33