Question

1)

a) The flue gas from a combustion process was found to contain 78% N2, 20% O2, 1.1% CO2 and 0.9% Ar. The gas was cooled to 298 K, pressurised to 2.0 x 105 Pa in the presence of water and allowed to come to equilibrium. Rank these gases in order from highest concentration to lowest concentration. The Henry’s Law constants for the gases at 298 K are:

kH(N2) = 6.45 x 10^–9 mol L–1 Pa–1

kH(O2) = 1.34 x 10^–8 mol L–1 Pa–1

kH(CO2) = 3.40 x 10^–7 mol L–1 Pa–1

kH(Ar) = 1.44 x 10^–8 mol L–1 Pa–1

b) Dispersion force interactions contribute to the dissolution of noble gas molecules in water. State whether helium or argon will have the highest solubility in water - explain why.

Answer 1

Using Henry's law,

S = K_{​​​​​​H} P

b) Argon is higher solubility in water than Helium. As molar mass increases, dispersion force increases. Argon has more strong dispersion interaction than helium.so argon is more soluble

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