Propose an efficient synthesis for each of the following transformations

Deposition is the transition of matter going from gas to solid without passing through the liquid phase.a.) gas—-> solid

Rate law for this reaction israte of the reaction = k[a]²[b].second order in a  means concentration of a in power of two, and  first order in b means concentration of b in power of one.

Answerstudying coal cumbustion as an energy source;