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Solutions question

2012 · Q69
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Solutions question

2012 · Q69

NEETChemistrySolutionsMCQ+4 / −1
Vapour pressure of chloroform (CHCl3) and dichloromethane (CH2Cl2) at 25oC are 200 mm Hg and 41.5 mm Hg respectively. Vapour pressure of the solution obtained by mixing 25.5 g of CHCl3 and 40 g of CH2Cl2 at the same temperature will be
(Molecular mass of CHCl3 = 119.5 u and molecular mass of CH2Cl2 = 85 u)
  1. A
    173.9 mm Hg
  2. B
    615.0 mm Hg
  3. C
    90.6 mm Hg
  4. D
    285.5 mm Hg
View written solutionFree

Correct answer: C

nCHCl3 = 25.5119.5{{25.5} \over {119.5}}119.525.5​ = 0.213

nCH2Cl2 = 4085{{40} \over {85}}8540​ = 0.47

PT = PoAXA + PoBXB

= 200×0.2130.683+41.5×0.470.683200 \times {{0.213} \over {0.683}} + 41.5 \times {{0.47} \over {0.683}}200×0.6830.213​+41.5×0.6830.47​

= 62 + 28.55

= 90.63

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