(a) Compute the particle-phase fraction of a component with volatility = 2 3 under organic aerosol mass loading, M = 0.2, 2, 20, 200 3. Please also explain how the particle-phase fraction of a component changes with organic aerosol mass loading. [4 points] (b) Compute the particle phase fraction of a component with volatility = 2, 20, 200, 2000 3 under organic aerosol mass loading = 20 3. Please also explain how the particle-phase fraction of a component changes with the volatility of the component. [4 points] (c) The saturation vapor pressure of -pinene (C10H16) is 2.93 mmHg under 25C. Compute the volatility of -pinene under such condition (1 atm, 25C). Based on the calculation, is -pinene prone to form aerosols? [3 point] (d) If the organic aerosol mass loading M increases, how will F change. Please also explain the physical meaning behind the relationship between M and F. [3 points]

> Question 1. Organic Aerosols and Gas-Aerosol Partitioning Theory (a) Compute the particle-phase fraction of a component with volatility C*= 2 ug m-3 under organic aerosol mass loading, M = 0.2, 2, 20, 200 ug m-3. Please also explain how the particle-phase fraction of a component changes with organic aerosol mass loading. [4 points] (b) Compute the particle phase fraction of a component with volatility C*= 2, 20, 200, 2000 ug m-3 under organic aerosol mass loading M = 20 ug m-3. Please also explain how the particle-phase fraction of a component changes with the volatility of the component. [4 points] (c) The saturation vapor pressure of a pinene (C10H16) is 2.93 mmHg under 25C. Compute the volatility of a pinene under such condition (1 atm, 25C). Based on the calculation, is a-pinene prone to form aerosols? (3 point] (d) If the organic aerosol mass loading M increases, how will F change. Please also explain the physical meaning behind the relationship between M and F. [3 points]