A gas has $K_H = 5\ \text{atm}$ in a given liquid at a certain temperature. If the partial pressure of the gas is $2.5\ \text{atm}$, what is the mole fraction $x$ of the gas dissolved in the liquid?
A0.2
B0.5
C2.0
D7.5
Answer & Solution
Correct answer: B. 0.5
Using Henry's law, $P = K_H x$. Hence $x = P/K_H = 2.5/5 = 0.5$. Options C and D come from incorrect algebra, while A is half the correct value.
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