please fast both question

Problem 1: Derive a general expression, based on the General Dynamic Equation (GDE) for the change with time and position, in a) the total number concentration, b) the total surface area c) the total volume of an aerosol, Hint: Consult Friedlander pages 310 through 312. Multiply the GDE through by the appropriate function of vp (particle volume) and integrate over all particle volumes. Ignore homogeneous nucleation. Problem 2: Atmospheric aerosols can change their size through particle-particle coagulation or through condensation of gases onto the particle surface. Which of these processes would you expect to be faster and why? Formulate your argument through consideration of rate controlling steps (always the slowest step in a sequential process)