KAREN G.
asked • 03/15/17please help me answering this question. Thank you
A mylar balloon is filled with helium gas to a pressure of 107 kPa when the temperature is 22°C. If the temperature changes to 45°C, what will be the pressure of the helium in the balloon?
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1 Expert Answer
J.R. S. answered • 03/16/17
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If that is the complete question, then you should probably assume the the volume remains constant. Thus, you have
P1/T1 = P2/T2 and the pressure will increase as you increase the temperature. Recall, temperature should be in Kelvin.
P1 = 107 kPa
T1 = 22ºC = 22 + 273 = 295ºK
P2 = ?
T2 = 45ºC = 45 + 273 = 318ºK
P1/T1 = P2/T2
107 kPa/295K = x/318 K
x = 115 kPa (note, this is greater than 107 kPa, as predicted)
Arturo O.
Karen,
With the additional assumption that the volume is constant, the problem may be solved, as in J.R.S.' solution. But the condition of constant volume should be stated in the problem. Was this problem assigned from a section in the chapter that dealt with constant volume processes?
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03/16/17
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Arturo O.
03/15/17