At 20 ° C the Henry's Law Constant for Argon

question 39

Multiple Choice

At 20 ° C the Henry's law constant for argon in water is 1.64×10 ^{- 3} molal/atm. How many grams of Ar (atomic mass = 39.9 g/mol) will dissolve in 500 g of water (molar mass = 18.0 g/mol) at 20 ° C if the pressure of Ar above the solution is 2.5 atm?

• A) 0.013 g
• B) 0.082 g
• C) 0.33 g
• D) 2.1×10 ^{- 3} g
• E) 8.2×10 ^{- 4} g

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