The Henry’s Law Constant for dimethyl sulfide is 0.14 mol/L-atm. Its

atmospheric concentration is 0.001 ppb (i.e., 0.001µg/L). Calculate the dissolved concentration of dimethyl sulfide in water.

To calculate the dissolved concentration of dimethyl sulfide in water, we can use Henry's Law, which states that the concentration of a gas dissolved in a liquid is directly proportional to the partial pressure of the gas above the liquid.

The formula for applying Henry's Law is C = k * P, where:
- C is the dissolved concentration of the gas in the liquid (in this case, dimethyl sulfide in water),
- k is Henry's Law constant for the gas in the specific medium (in this case, water),
- P is the partial pressure of the gas above the liquid.

Given:
- Henry's Law constant for dimethyl sulfide (k) = 0.14 mol/L-atm,
- Atmospheric concentration of dimethyl sulfide = 0.001 ppb (0.001 µg/L).

Before applying Henry's Law, we need to convert the atmospheric concentration from ppb to atm:

1 ppb = 1/1,000,000,000
0.001 ppb = 0.001/1,000,000,000 = 0.000000001 atm

Now, we can use Henry's Law to calculate the dissolved concentration (C):

C = k * P = 0.14 mol/L-atm * 0.000000001 atm = 0.00000000014 mol/L

Therefore, the dissolved concentration of dimethyl sulfide in water is 0.00000000014 mol/L.