A conelation for methane solubility in seawater13is given by the equation
where
(a) Estimate the mole fraction of methane in seawater for equilibrium at the given conditions. Use a mean molecular weight of 18.4 g/mol for seawater. What is the Henry's law constant at this temperature and salinity?
(b) What does the above equation say about the effect of S on methane solubility?
(c) Use the Henry’s law constant from Part (a) to estimate methane solubility at the given temperature and salinity, but 5000 ft below the ocean surface. (Hint: Estimate the pressure at that depth.)
Exploratory Exercise—Research and Discover(d) At the low temperatures and high pressures associated with the depths described in Part (c), methane can combine with water to form methane hydrates, which may affect both energy availability and the environment. Explain (i) how such behavior would in?uence the results in Part (c) and (ii) how dissolution of methane in seawater might affect energy availability and the environment.
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