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Question

A flask having a volume of 250 mL and containing air is heated to 100C and sealed. Then the flask is cooled to 25C, immersed in water, and opened. What volume of water will be drawn back into the flask, assuming the pressure remaining constant?


A

55.27 cm3

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B

63.24 cm3

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C

72.32 cm3

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D

50.27 cm3

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Solution

The correct option is D

50.27 cm3


Let the volume (V1) of the flask be 250 mL

Temperature (T1) = 100 + 273 = 373 K

Flask cooled to temperature T2 = 25 + 273 = 298 K

According to Charles' law,

V1T1=V2T2

Hence, the volume V2 at 298 K is V1×T2T1

Therefore, V2 =250×298273= 199.73 cm3

Therefore, water drawn back is 250 - 199.73 = 50.27 cm3


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