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A given mass of gas has a pressure of 80 Nm\(^{-2}\) at a temperature of...

Physics
JAMB 2021

A given mass of gas has a pressure of 80 Nm\(^{-2}\) at a temperature of 47 C. If the temperature is reduced to 27 C with volume remaining constant, the new pressure is?

  • A. 46.0 Nm\(^{-2}\)
  • B. 75.0 Nm\(^{-2}\)
  • C. 80.0 Nm\(^{-2}\)
  • D. 85.3 Nm\(^{-2}\)
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Correct Answer: Option B
Explanation

Using \(\frac{P_{1}}{T_{1}} = \frac{P_{2}}{T_{2}}\)

P\(_{1}\) = 80Nm\(^{2}\)
T\(_{1}\) = 47 + 273 = 320k
T\(_{2}\) = 27 + 273 = 300k
P\(_{2}\)?

\(\therefore\) = P\(_{2}\) = \(\frac{P_{1}T_{2}}{T_{1}}\)

= \(\frac{80 \times 300}{320}\) = 75.Nm\(^{2}\)

There is an explanation video available below.


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Explanation Video

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WAEC GCE Nov/Dec 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 332996
JAMB CBT 2025 - Candidates, Schools, Centres, Resellers - Get Ready!
JAMB 2025 UTME Revisions Have Begun
JAMB 2025 Whatsapp Group - Join us here
WAEC GCE Nov/Dec 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 332996
JAMB 2025 UTME Revisions Have Begun
JAMB CBT 2025 - Candidates, Schools, Centres, Resellers - Get Ready!
Myschool's prices for products & services are going up in November - Buy what you need now