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100cc of gas is collected over at 15°C and 750 torr. If the gas occupies 91.9 ml in dry state at STP, then the aqueous tension (F) at STP is____?

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1320 mm

1.32 mm

13.2 mm

132 mm

answer is B.

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Detailed Solution

$\begin{array}{l} Given condition & STP \\ P_{1} = (750 - F) mm & P_{2} = 760 mm \\ V_{1} = 100 ml & V_{2} = 91.9 ml \\ T_{1} = 288 k & T_{2} = 273 k \end{array}$

$\frac{P_{1} V_{1}}{T_{1}} = \frac{P_{2} V_{2}}{T_{2}} \frac{(750 - F) \times 100}{288} = \frac{760 \times 91.9}{273}$

Aqueous tension F = 750-736.8 = 13.2 mm

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