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3. Calculate the concentration of benzene (C6H6) in water (mg/L, to two decimal places) if the gas phase
concentration contains 0.15% (use KH = 0.18 mol/L.atm).

4. Calculate the concentration of methane (CH4) in water (µg/L, to two decimal places) if the gas phase
concentration contains 0.015% (use KH = 1.41 X 10³ mol/L.atm).