Let gas (A) present in air is dissolved ...

Let gas (A) present in air is dissolved in 20 moles of water at 298K and 20 atm pressure. The mole fraction of gas (A) in air is 0.2 and the Henry's law constant for solubility of gas (A) in water at 298K is `1×10^5`atm.The number of mole of gas (A) dissolved in water will be

`8×10^(-5)`

`4×10^(-4)`

`8×10^(-4)`

`6×10^(-5)`

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