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2. A 250.0 mL container of gas is at 150.0°C. At what temperature will the gas occupy a volume of 125 mL? (assume constant pr
puulle Will the gas Dulle constant pressure) 3. An open flask of air is cooled. a. Does it contain more gas molecules before
b. Is the pressure the same, greater or less than before it was cooled? 4. An open flask of air is heated, stoppered in the h
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Answer #1

2.

Initial temperature (T1) = 250 oC = (250 + 273) K = 523 K

Initial volume (V1) = 250.0 mL

Final volume (V2) = 125 mL

Let us say that the final temperature of the gas = T2

From Charles law,

V1/T1 = V2/T2

or, 250.0 mL/523 K = 125 mL/T2

or, T2 = 261.5 K

          = (261.5 - 273) oC

          = - 11.5 oC

Hence, the temperature at which the gas will occupy 125 mL = - 11.5 oC

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