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Question

112 cm^3 of nitrogen gas is collected at a pressure of 720 mm of mercury.If the temperature remains constant,find its volume when the pressure is:

  1. 760 mm cm^3 of mercury
  2. 20 cm of mercury
  3. Pressure drops by 40% of initial Pressue

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Solution

As the temperature is constant so, let us use Boyle's law to find the new volume.
Initial pressure, P1 = 720 mm og Hg = 72 cm of Hg
Initial Volume, V1 = 112 cm3
Applying Boyle's law,
1. P1V1=P2V272×112=76×V2V2=72×11276=106.10 cm32. P1V1=P3V372×112=20×V3V3=72×11220=403.2 cm33. P1V1=P4V472×112=20×V4V4=72×1120.6×72=186.67 cm3

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