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A given volume of methane diffuses in 20 seconds. How long will it take the...

Chemistry
WAEC 1997

A given volume of methane diffuses in 20 seconds. How long will it take the same volume of sulphur (IV) oxide to diffuse under the same conditions? [CH4 = 16; SO2 = 64]

  • A. 5 seconds
  • B. 20 seconds
  • C. 40 seconds
  • D. 60 seconds
  • E. 80 seconds
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Correct Answer: Option C
Explanation

Applying the Graham's law defination; i.e,

\(\frac{R(SO_2)}{R(CH_4)} = \sqrt{\frac{M(CH_4)}{M(SO_2)}} = \frac{t(CH_4)}{t(SO_2)}\)

Where t(SO\(_2\)) = ?, M(SO\(_2\)) = 64

t(Ch\(_4\)) = 20 sec, M(Ch\(_4\)) = 16

therefore, \(\frac{t(SO_2)}{20}\) = \(\sqrt{\frac{64}{16}}\)

\(\frac{t(SO_2)}{20}\) = \(\frac{8}{4}\)

t(SO\(_2\)) = 8 x \(\frac{20}{4}\)

= 40 sec.


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WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709