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Question

Calculate the mass in mole of CO2 that will dissolve in enough water to form 900mL of solution at 20C if the partial pressure of CO2 is 1atm. KH for CO2 is 2.3×102mol/litreatm.

A
0.0401mole
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B
0.0301mole
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C
0.0217mole
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D
0.0207mole
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Solution

The correct option is C 0.0207mole
According to Henry's law, S=KP
S is the solubility in moles per litre
K is the henry's law constant
P is the pressure in atm.
Substitute values in the above expression.
S=2.3×102mol/litre atm1×1 atm=2.3×102M
Thus 1 L of solution contains 2.3×102 moles of carbon dioxide.
900 ml of solution will contain 2.3×102×9001000=0.0207 mole.

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