The partial pressure of ethane over a saturated solution containing 0.0656g of ethane is 1 bar. If the solution contains 0.0500g of ethane, then what should be the partial pressure of the gas?

0.762 bar

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0.755 bar

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0.764 bar

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0.772 bar

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Solution

The correct option is A 0.762 bar

For a gas that has a very high solubility, we may assume that the partial pressure of the gas is directly proportional to its mass.
Here, $P \propto m$

$\Rightarrow \frac{P_{2}}{P_{1}} = \frac{m_{2}}{m_{1}}$

$\Rightarrow P_{2} = P_{1} \times \frac{m_{2}}{m_{1}}$

$= 1 \times \frac{0.05}{0.0656} = 0.762$ bar

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QUESTION 2.13

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The partial pressure of ethane over a saturated solution containing 0.0656g of ethane is 1 bar. If the solution contains 0.0500g of ethane, then what should be the partial pressure of the gas?

The correct option is A 0.762 bar For a gas that has a very high solubility, we may assume that the partial pressure of the gas is directly proportional to its mass. Here, P∝m ⇒P2P1=m2m1 ⇒P2=P1×m2m1 =1×0.050.0656=0.762 bar