Question 54 VX and Sarin were developed for chemical warfare. Structurally, how

Question

Question 54

VX and Sarin were developed for chemical warfare. Structurally, how are these related to some insecticides? For an organic chemical of interest, say the "dimensionless" Henry's Law constant (H/RT) is 2 = c_air/c_water A system has 100 mL of air and 5 mL of water. What is the fraction of the chemical in the air in this system? For the system for the above problem, some soil is added that has no organic carbon (OC). (f_oc = 0) Based on how we considered partitioning to soil to occur, will the fraction of the chemical in the air go up, go down, or remain unchanged? Why? What is the main assumption in a "Level 1 Fugacity" Box Model? In purging a water volume with gas bubbles, will the loss of volatile chemicals occur in a linear or exponential way? why? what is the math?

Explanation / Answer

2 = Cair / Cwater

Cair = x / Volume of air

Cwater = (1-x) / volume of water

2 = x /100 / (1-x)/5

2*100/5 = x/(1-x)

40 = x/(1-x)

40-40x = x

41x = 40

x = 40/41

x = 0.9756

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