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50 cm\(_3\) of gas was collected over water at 10ºC and 765 mm Hg. Calculate...

Chemistry
JAMB 2012

50 cm\(_3\) of gas was collected over water at 10ºC and 765 mm Hg. Calculate the volume of the gas at s.t.p. if the saturated vapour pressure of water at 10ºC is 5mm Hg

  • A. 49.19 cm 3
  • B. 48.87 cm 3
  • C. 48.55 cm 3
  • D. 48.23 cm 3
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Correct Answer: Option D
Explanation

General Gas Equation:

\(\frac{P_1 V_1}{T_1}\) = \(\frac{P_2 V_2}{T_2}\)

where P\(_1\) = 765 - 5 = 760mmhg

\(V_2 = \frac{P_1 V_1 T_2}{P_2 T_1}\) 

\(V_2 = \frac{760 * 50 * 273}{ 760 * 283}\) → 48.23cm\(^3\)

There is an explanation video available below.


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Explanation Video

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Join your school's WhatsApp group
Join your school's WhatsApp group
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts