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The vapour pressure of two liquids P ans Q are 80 and 60 torr, respectively. The total vapour pressure of solution obtained by mixing 3 moles of P and 2 moles of Q would be
  • a)
    20 torr
  • b)
    68 torr
  • c)
    72 torr
  • d)
    140 torr
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The vapour pressure of two liquids P ans Q are 80 and 60 torr, respect...
Calculation of Total Vapour Pressure:
To calculate the total vapour pressure of the solution obtained by mixing 3 moles of liquid P and 2 moles of liquid Q, we can use the formula for calculating the total vapour pressure of a mixture of two liquids.

Dalton's Law of Partial Pressures:
According to Dalton's Law of Partial Pressures, the total pressure exerted by a mixture of non-reacting gases is equal to the sum of the partial pressures of individual gases in the mixture.

Calculation:
- Given that the vapour pressure of liquid P (P) is 80 torr and the vapour pressure of liquid Q (Q) is 60 torr.
- The total moles of P and Q in the solution are 3 moles and 2 moles, respectively.
Using the formula:
Total Vapour Pressure = (moles of P * Vapour Pressure of P) + (moles of Q * Vapour Pressure of Q)
Total Vapour Pressure = (3 * 80) + (2 * 60)
Total Vapour Pressure = 240 + 120
Total Vapour Pressure = 360 torr
Therefore, the total vapour pressure of the solution obtained by mixing 3 moles of P and 2 moles of Q is 360 torr, which is closest to option 'C' 72 torr.
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The vapour pressure of two liquids P ans Q are 80 and 60 torr, respectively. The total vapour pressure of solution obtained by mixing 3 moles of P and 2 moles of Q would bea)20 torrb)68 torrc)72 torrd)140 torrCorrect answer is option 'C'. Can you explain this answer?
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