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CO(g) + H\(_2\) O\(_{(g)}\) → CO\(_{2(g)}\) + H\(_{2(g)}\) Calculate the standard heat change of the...

Chemistry
JAMB 2012

CO(g) + H\(_2\) O\(_{(g)}\) → CO\(_{2(g)}\) + H\(_{2(g)}\)
Calculate the standard heat change of the reaction above, if the standard enthalpies of formation of CO\(_{2(g)}\), H\(_2\)O\(_{(g)}\) and CO\(_{(g)}\) in kJmol\(^{-1}\) are - 394, -242 and - 110 respectively.

  • A. + 262 KJ mol -1
  • B. - 262 KJ mol -1
  • C. + 42 KJ mol -1
  • D. - 42 KJ mol -1
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Correct Answer: Option D
Explanation

\(\Delta H (formation) (CO_2) = -394\)

\(\Delta H (formation) (H_2 O) = -242\)

\(\Delta H (formation) (CO) = -110\)

\(X = \sum H_{P} ^{F} - \sum H_{R} ^{F}\)

= (-394+ 0) - (-110 - 242 )

= -394 +352

= - 42 kJmol\(^{-1}\)

There is an explanation video available below.


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Explanation Video

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