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Question
Choose the most correct option.
The vapour pressure of a solution containing 2 moles of a solute in 2 moles of water (vapour pressure of pure water = 24 mm Hg) is ______.
Options
24 mm Hg
32 mm Hg
48 mm Hg
12 mm Hg
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Solution
The vapour pressure of a solution containing 2 moles of a solute in 2 moles of water (vapour pressure of pure water = 24 mm Hg) is 12 mm Hg.
Explanation:
Calculate the Mole Fraction of Water:
`X_"water" = "Moles of water"/("Moles of water" + "Moles of solute")`
Substitute the Values:
`= 2/(2 + 2)`
`= 2/4`
= 0.5
Apply Raoult's Law:
PSolution = Pwater . Xwater
PA = 24 mm Hg × 0.5
PA = 12mm Hg
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