A child's balloon has a volume 3.80 dm3, when the temperature is 35°C. If the balloon is put in a refrigerator and cooled to 5°C, the approximate volume of the balloon is (assume pressure inside the balloon is equal to atmospheric pressure):
Correct answer: B. 3.43 dm3
- A. 3.00 dm3
- B. 3.43 dm3
- C. 3.08 dm3
- D. 3.25 dm3
- E. 0.54 dm3
Explanation
V1=3.8 dm3 ; T1= 35 +273=308K V2=?; T2=5+273=278K V1/T1=V2/T2 3.8/308=V2/278 V2=3.43 dm3
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About Charles's Law
At constant pressure, the volume of a fixed mass of gas is directly proportional to its absolute temperature. Questions involve the Kelvin scale, the equation V₁/T₁ = V₂/T₂, volume-temperature graphs, and the need to distinguish Charles's law from Boyle's law, which relates pressure and volume.
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